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Source file src/time/time_test.go

Documentation: time

  // Copyright 2009 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package time_test
  
  import (
  	"bytes"
  	"encoding/gob"
  	"encoding/json"
  	"fmt"
  	"math/big"
  	"math/rand"
  	"os"
  	"runtime"
  	"strings"
  	"testing"
  	"testing/quick"
  	. "time"
  )
  
  // We should be in PST/PDT, but if the time zone files are missing we
  // won't be. The purpose of this test is to at least explain why some of
  // the subsequent tests fail.
  func TestZoneData(t *testing.T) {
  	lt := Now()
  	// PST is 8 hours west, PDT is 7 hours west. We could use the name but it's not unique.
  	if name, off := lt.Zone(); off != -8*60*60 && off != -7*60*60 {
  		t.Errorf("Unable to find US Pacific time zone data for testing; time zone is %q offset %d", name, off)
  		t.Error("Likely problem: the time zone files have not been installed.")
  	}
  }
  
  // parsedTime is the struct representing a parsed time value.
  type parsedTime struct {
  	Year                 int
  	Month                Month
  	Day                  int
  	Hour, Minute, Second int // 15:04:05 is 15, 4, 5.
  	Nanosecond           int // Fractional second.
  	Weekday              Weekday
  	ZoneOffset           int    // seconds east of UTC, e.g. -7*60*60 for -0700
  	Zone                 string // e.g., "MST"
  }
  
  type TimeTest struct {
  	seconds int64
  	golden  parsedTime
  }
  
  var utctests = []TimeTest{
  	{0, parsedTime{1970, January, 1, 0, 0, 0, 0, Thursday, 0, "UTC"}},
  	{1221681866, parsedTime{2008, September, 17, 20, 4, 26, 0, Wednesday, 0, "UTC"}},
  	{-1221681866, parsedTime{1931, April, 16, 3, 55, 34, 0, Thursday, 0, "UTC"}},
  	{-11644473600, parsedTime{1601, January, 1, 0, 0, 0, 0, Monday, 0, "UTC"}},
  	{599529660, parsedTime{1988, December, 31, 0, 1, 0, 0, Saturday, 0, "UTC"}},
  	{978220860, parsedTime{2000, December, 31, 0, 1, 0, 0, Sunday, 0, "UTC"}},
  }
  
  var nanoutctests = []TimeTest{
  	{0, parsedTime{1970, January, 1, 0, 0, 0, 1e8, Thursday, 0, "UTC"}},
  	{1221681866, parsedTime{2008, September, 17, 20, 4, 26, 2e8, Wednesday, 0, "UTC"}},
  }
  
  var localtests = []TimeTest{
  	{0, parsedTime{1969, December, 31, 16, 0, 0, 0, Wednesday, -8 * 60 * 60, "PST"}},
  	{1221681866, parsedTime{2008, September, 17, 13, 4, 26, 0, Wednesday, -7 * 60 * 60, "PDT"}},
  }
  
  var nanolocaltests = []TimeTest{
  	{0, parsedTime{1969, December, 31, 16, 0, 0, 1e8, Wednesday, -8 * 60 * 60, "PST"}},
  	{1221681866, parsedTime{2008, September, 17, 13, 4, 26, 3e8, Wednesday, -7 * 60 * 60, "PDT"}},
  }
  
  func same(t Time, u *parsedTime) bool {
  	// Check aggregates.
  	year, month, day := t.Date()
  	hour, min, sec := t.Clock()
  	name, offset := t.Zone()
  	if year != u.Year || month != u.Month || day != u.Day ||
  		hour != u.Hour || min != u.Minute || sec != u.Second ||
  		name != u.Zone || offset != u.ZoneOffset {
  		return false
  	}
  	// Check individual entries.
  	return t.Year() == u.Year &&
  		t.Month() == u.Month &&
  		t.Day() == u.Day &&
  		t.Hour() == u.Hour &&
  		t.Minute() == u.Minute &&
  		t.Second() == u.Second &&
  		t.Nanosecond() == u.Nanosecond &&
  		t.Weekday() == u.Weekday
  }
  
  func TestSecondsToUTC(t *testing.T) {
  	for _, test := range utctests {
  		sec := test.seconds
  		golden := &test.golden
  		tm := Unix(sec, 0).UTC()
  		newsec := tm.Unix()
  		if newsec != sec {
  			t.Errorf("SecondsToUTC(%d).Seconds() = %d", sec, newsec)
  		}
  		if !same(tm, golden) {
  			t.Errorf("SecondsToUTC(%d):  // %#v", sec, tm)
  			t.Errorf("  want=%+v", *golden)
  			t.Errorf("  have=%v", tm.Format(RFC3339+" MST"))
  		}
  	}
  }
  
  func TestNanosecondsToUTC(t *testing.T) {
  	for _, test := range nanoutctests {
  		golden := &test.golden
  		nsec := test.seconds*1e9 + int64(golden.Nanosecond)
  		tm := Unix(0, nsec).UTC()
  		newnsec := tm.Unix()*1e9 + int64(tm.Nanosecond())
  		if newnsec != nsec {
  			t.Errorf("NanosecondsToUTC(%d).Nanoseconds() = %d", nsec, newnsec)
  		}
  		if !same(tm, golden) {
  			t.Errorf("NanosecondsToUTC(%d):", nsec)
  			t.Errorf("  want=%+v", *golden)
  			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
  		}
  	}
  }
  
  func TestSecondsToLocalTime(t *testing.T) {
  	for _, test := range localtests {
  		sec := test.seconds
  		golden := &test.golden
  		tm := Unix(sec, 0)
  		newsec := tm.Unix()
  		if newsec != sec {
  			t.Errorf("SecondsToLocalTime(%d).Seconds() = %d", sec, newsec)
  		}
  		if !same(tm, golden) {
  			t.Errorf("SecondsToLocalTime(%d):", sec)
  			t.Errorf("  want=%+v", *golden)
  			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
  		}
  	}
  }
  
  func TestNanosecondsToLocalTime(t *testing.T) {
  	for _, test := range nanolocaltests {
  		golden := &test.golden
  		nsec := test.seconds*1e9 + int64(golden.Nanosecond)
  		tm := Unix(0, nsec)
  		newnsec := tm.Unix()*1e9 + int64(tm.Nanosecond())
  		if newnsec != nsec {
  			t.Errorf("NanosecondsToLocalTime(%d).Seconds() = %d", nsec, newnsec)
  		}
  		if !same(tm, golden) {
  			t.Errorf("NanosecondsToLocalTime(%d):", nsec)
  			t.Errorf("  want=%+v", *golden)
  			t.Errorf("  have=%+v", tm.Format(RFC3339+" MST"))
  		}
  	}
  }
  
  func TestSecondsToUTCAndBack(t *testing.T) {
  	f := func(sec int64) bool { return Unix(sec, 0).UTC().Unix() == sec }
  	f32 := func(sec int32) bool { return f(int64(sec)) }
  	cfg := &quick.Config{MaxCount: 10000}
  
  	// Try a reasonable date first, then the huge ones.
  	if err := quick.Check(f32, cfg); err != nil {
  		t.Fatal(err)
  	}
  	if err := quick.Check(f, cfg); err != nil {
  		t.Fatal(err)
  	}
  }
  
  func TestNanosecondsToUTCAndBack(t *testing.T) {
  	f := func(nsec int64) bool {
  		t := Unix(0, nsec).UTC()
  		ns := t.Unix()*1e9 + int64(t.Nanosecond())
  		return ns == nsec
  	}
  	f32 := func(nsec int32) bool { return f(int64(nsec)) }
  	cfg := &quick.Config{MaxCount: 10000}
  
  	// Try a small date first, then the large ones. (The span is only a few hundred years
  	// for nanoseconds in an int64.)
  	if err := quick.Check(f32, cfg); err != nil {
  		t.Fatal(err)
  	}
  	if err := quick.Check(f, cfg); err != nil {
  		t.Fatal(err)
  	}
  }
  
  // The time routines provide no way to get absolute time
  // (seconds since zero), but we need it to compute the right
  // answer for bizarre roundings like "to the nearest 3 ns".
  // Compute as t - year1 = (t - 1970) + (1970 - 2001) + (2001 - 1).
  // t - 1970 is returned by Unix and Nanosecond.
  // 1970 - 2001 is -(31*365+8)*86400 = -978307200 seconds.
  // 2001 - 1 is 2000*365.2425*86400 = 63113904000 seconds.
  const unixToZero = -978307200 + 63113904000
  
  // abs returns the absolute time stored in t, as seconds and nanoseconds.
  func abs(t Time) (sec, nsec int64) {
  	unix := t.Unix()
  	nano := t.Nanosecond()
  	return unix + unixToZero, int64(nano)
  }
  
  // absString returns abs as a decimal string.
  func absString(t Time) string {
  	sec, nsec := abs(t)
  	if sec < 0 {
  		sec = -sec
  		nsec = -nsec
  		if nsec < 0 {
  			nsec += 1e9
  			sec--
  		}
  		return fmt.Sprintf("-%d%09d", sec, nsec)
  	}
  	return fmt.Sprintf("%d%09d", sec, nsec)
  }
  
  var truncateRoundTests = []struct {
  	t Time
  	d Duration
  }{
  	{Date(-1, January, 1, 12, 15, 30, 5e8, UTC), 3},
  	{Date(-1, January, 1, 12, 15, 31, 5e8, UTC), 3},
  	{Date(2012, January, 1, 12, 15, 30, 5e8, UTC), Second},
  	{Date(2012, January, 1, 12, 15, 31, 5e8, UTC), Second},
  	{Unix(-19012425939, 649146258), 7435029458905025217}, // 5.8*d rounds to 6*d, but .8*d+.8*d < 0 < d
  }
  
  func TestTruncateRound(t *testing.T) {
  	var (
  		bsec  = new(big.Int)
  		bnsec = new(big.Int)
  		bd    = new(big.Int)
  		bt    = new(big.Int)
  		br    = new(big.Int)
  		bq    = new(big.Int)
  		b1e9  = new(big.Int)
  	)
  
  	b1e9.SetInt64(1e9)
  
  	testOne := func(ti, tns, di int64) bool {
  		t0 := Unix(ti, int64(tns)).UTC()
  		d := Duration(di)
  		if d < 0 {
  			d = -d
  		}
  		if d <= 0 {
  			d = 1
  		}
  
  		// Compute bt = absolute nanoseconds.
  		sec, nsec := abs(t0)
  		bsec.SetInt64(sec)
  		bnsec.SetInt64(nsec)
  		bt.Mul(bsec, b1e9)
  		bt.Add(bt, bnsec)
  
  		// Compute quotient and remainder mod d.
  		bd.SetInt64(int64(d))
  		bq.DivMod(bt, bd, br)
  
  		// To truncate, subtract remainder.
  		// br is < d, so it fits in an int64.
  		r := br.Int64()
  		t1 := t0.Add(-Duration(r))
  
  		// Check that time.Truncate works.
  		if trunc := t0.Truncate(d); trunc != t1 {
  			t.Errorf("Time.Truncate(%s, %s) = %s, want %s\n"+
  				"%v trunc %v =\n%v want\n%v",
  				t0.Format(RFC3339Nano), d, trunc, t1.Format(RFC3339Nano),
  				absString(t0), int64(d), absString(trunc), absString(t1))
  			return false
  		}
  
  		// To round, add d back if remainder r > d/2 or r == exactly d/2.
  		// The commented out code would round half to even instead of up,
  		// but that makes it time-zone dependent, which is a bit strange.
  		if r > int64(d)/2 || r+r == int64(d) /*&& bq.Bit(0) == 1*/ {
  			t1 = t1.Add(Duration(d))
  		}
  
  		// Check that time.Round works.
  		if rnd := t0.Round(d); rnd != t1 {
  			t.Errorf("Time.Round(%s, %s) = %s, want %s\n"+
  				"%v round %v =\n%v want\n%v",
  				t0.Format(RFC3339Nano), d, rnd, t1.Format(RFC3339Nano),
  				absString(t0), int64(d), absString(rnd), absString(t1))
  			return false
  		}
  		return true
  	}
  
  	// manual test cases
  	for _, tt := range truncateRoundTests {
  		testOne(tt.t.Unix(), int64(tt.t.Nanosecond()), int64(tt.d))
  	}
  
  	// exhaustive near 0
  	for i := 0; i < 100; i++ {
  		for j := 1; j < 100; j++ {
  			testOne(unixToZero, int64(i), int64(j))
  			testOne(unixToZero, -int64(i), int64(j))
  			if t.Failed() {
  				return
  			}
  		}
  	}
  
  	if t.Failed() {
  		return
  	}
  
  	// randomly generated test cases
  	cfg := &quick.Config{MaxCount: 100000}
  	if testing.Short() {
  		cfg.MaxCount = 1000
  	}
  
  	// divisors of Second
  	f1 := func(ti int64, tns int32, logdi int32) bool {
  		d := Duration(1)
  		a, b := uint(logdi%9), (logdi>>16)%9
  		d <<= a
  		for i := 0; i < int(b); i++ {
  			d *= 5
  		}
  		return testOne(ti, int64(tns), int64(d))
  	}
  	quick.Check(f1, cfg)
  
  	// multiples of Second
  	f2 := func(ti int64, tns int32, di int32) bool {
  		d := Duration(di) * Second
  		if d < 0 {
  			d = -d
  		}
  		return testOne(ti, int64(tns), int64(d))
  	}
  	quick.Check(f2, cfg)
  
  	// halfway cases
  	f3 := func(tns, di int64) bool {
  		di &= 0xfffffffe
  		if di == 0 {
  			di = 2
  		}
  		tns -= tns % di
  		if tns < 0 {
  			tns += di / 2
  		} else {
  			tns -= di / 2
  		}
  		return testOne(0, tns, di)
  	}
  	quick.Check(f3, cfg)
  
  	// full generality
  	f4 := func(ti int64, tns int32, di int64) bool {
  		return testOne(ti, int64(tns), di)
  	}
  	quick.Check(f4, cfg)
  }
  
  type ISOWeekTest struct {
  	year       int // year
  	month, day int // month and day
  	yex        int // expected year
  	wex        int // expected week
  }
  
  var isoWeekTests = []ISOWeekTest{
  	{1981, 1, 1, 1981, 1}, {1982, 1, 1, 1981, 53}, {1983, 1, 1, 1982, 52},
  	{1984, 1, 1, 1983, 52}, {1985, 1, 1, 1985, 1}, {1986, 1, 1, 1986, 1},
  	{1987, 1, 1, 1987, 1}, {1988, 1, 1, 1987, 53}, {1989, 1, 1, 1988, 52},
  	{1990, 1, 1, 1990, 1}, {1991, 1, 1, 1991, 1}, {1992, 1, 1, 1992, 1},
  	{1993, 1, 1, 1992, 53}, {1994, 1, 1, 1993, 52}, {1995, 1, 2, 1995, 1},
  	{1996, 1, 1, 1996, 1}, {1996, 1, 7, 1996, 1}, {1996, 1, 8, 1996, 2},
  	{1997, 1, 1, 1997, 1}, {1998, 1, 1, 1998, 1}, {1999, 1, 1, 1998, 53},
  	{2000, 1, 1, 1999, 52}, {2001, 1, 1, 2001, 1}, {2002, 1, 1, 2002, 1},
  	{2003, 1, 1, 2003, 1}, {2004, 1, 1, 2004, 1}, {2005, 1, 1, 2004, 53},
  	{2006, 1, 1, 2005, 52}, {2007, 1, 1, 2007, 1}, {2008, 1, 1, 2008, 1},
  	{2009, 1, 1, 2009, 1}, {2010, 1, 1, 2009, 53}, {2010, 1, 1, 2009, 53},
  	{2011, 1, 1, 2010, 52}, {2011, 1, 2, 2010, 52}, {2011, 1, 3, 2011, 1},
  	{2011, 1, 4, 2011, 1}, {2011, 1, 5, 2011, 1}, {2011, 1, 6, 2011, 1},
  	{2011, 1, 7, 2011, 1}, {2011, 1, 8, 2011, 1}, {2011, 1, 9, 2011, 1},
  	{2011, 1, 10, 2011, 2}, {2011, 1, 11, 2011, 2}, {2011, 6, 12, 2011, 23},
  	{2011, 6, 13, 2011, 24}, {2011, 12, 25, 2011, 51}, {2011, 12, 26, 2011, 52},
  	{2011, 12, 27, 2011, 52}, {2011, 12, 28, 2011, 52}, {2011, 12, 29, 2011, 52},
  	{2011, 12, 30, 2011, 52}, {2011, 12, 31, 2011, 52}, {1995, 1, 1, 1994, 52},
  	{2012, 1, 1, 2011, 52}, {2012, 1, 2, 2012, 1}, {2012, 1, 8, 2012, 1},
  	{2012, 1, 9, 2012, 2}, {2012, 12, 23, 2012, 51}, {2012, 12, 24, 2012, 52},
  	{2012, 12, 30, 2012, 52}, {2012, 12, 31, 2013, 1}, {2013, 1, 1, 2013, 1},
  	{2013, 1, 6, 2013, 1}, {2013, 1, 7, 2013, 2}, {2013, 12, 22, 2013, 51},
  	{2013, 12, 23, 2013, 52}, {2013, 12, 29, 2013, 52}, {2013, 12, 30, 2014, 1},
  	{2014, 1, 1, 2014, 1}, {2014, 1, 5, 2014, 1}, {2014, 1, 6, 2014, 2},
  	{2015, 1, 1, 2015, 1}, {2016, 1, 1, 2015, 53}, {2017, 1, 1, 2016, 52},
  	{2018, 1, 1, 2018, 1}, {2019, 1, 1, 2019, 1}, {2020, 1, 1, 2020, 1},
  	{2021, 1, 1, 2020, 53}, {2022, 1, 1, 2021, 52}, {2023, 1, 1, 2022, 52},
  	{2024, 1, 1, 2024, 1}, {2025, 1, 1, 2025, 1}, {2026, 1, 1, 2026, 1},
  	{2027, 1, 1, 2026, 53}, {2028, 1, 1, 2027, 52}, {2029, 1, 1, 2029, 1},
  	{2030, 1, 1, 2030, 1}, {2031, 1, 1, 2031, 1}, {2032, 1, 1, 2032, 1},
  	{2033, 1, 1, 2032, 53}, {2034, 1, 1, 2033, 52}, {2035, 1, 1, 2035, 1},
  	{2036, 1, 1, 2036, 1}, {2037, 1, 1, 2037, 1}, {2038, 1, 1, 2037, 53},
  	{2039, 1, 1, 2038, 52}, {2040, 1, 1, 2039, 52},
  }
  
  func TestISOWeek(t *testing.T) {
  	// Selected dates and corner cases
  	for _, wt := range isoWeekTests {
  		dt := Date(wt.year, Month(wt.month), wt.day, 0, 0, 0, 0, UTC)
  		y, w := dt.ISOWeek()
  		if w != wt.wex || y != wt.yex {
  			t.Errorf("got %d/%d; expected %d/%d for %d-%02d-%02d",
  				y, w, wt.yex, wt.wex, wt.year, wt.month, wt.day)
  		}
  	}
  
  	// The only real invariant: Jan 04 is in week 1
  	for year := 1950; year < 2100; year++ {
  		if y, w := Date(year, January, 4, 0, 0, 0, 0, UTC).ISOWeek(); y != year || w != 1 {
  			t.Errorf("got %d/%d; expected %d/1 for Jan 04", y, w, year)
  		}
  	}
  }
  
  type YearDayTest struct {
  	year, month, day int
  	yday             int
  }
  
  // Test YearDay in several different scenarios
  // and corner cases
  var yearDayTests = []YearDayTest{
  	// Non-leap-year tests
  	{2007, 1, 1, 1},
  	{2007, 1, 15, 15},
  	{2007, 2, 1, 32},
  	{2007, 2, 15, 46},
  	{2007, 3, 1, 60},
  	{2007, 3, 15, 74},
  	{2007, 4, 1, 91},
  	{2007, 12, 31, 365},
  
  	// Leap-year tests
  	{2008, 1, 1, 1},
  	{2008, 1, 15, 15},
  	{2008, 2, 1, 32},
  	{2008, 2, 15, 46},
  	{2008, 3, 1, 61},
  	{2008, 3, 15, 75},
  	{2008, 4, 1, 92},
  	{2008, 12, 31, 366},
  
  	// Looks like leap-year (but isn't) tests
  	{1900, 1, 1, 1},
  	{1900, 1, 15, 15},
  	{1900, 2, 1, 32},
  	{1900, 2, 15, 46},
  	{1900, 3, 1, 60},
  	{1900, 3, 15, 74},
  	{1900, 4, 1, 91},
  	{1900, 12, 31, 365},
  
  	// Year one tests (non-leap)
  	{1, 1, 1, 1},
  	{1, 1, 15, 15},
  	{1, 2, 1, 32},
  	{1, 2, 15, 46},
  	{1, 3, 1, 60},
  	{1, 3, 15, 74},
  	{1, 4, 1, 91},
  	{1, 12, 31, 365},
  
  	// Year minus one tests (non-leap)
  	{-1, 1, 1, 1},
  	{-1, 1, 15, 15},
  	{-1, 2, 1, 32},
  	{-1, 2, 15, 46},
  	{-1, 3, 1, 60},
  	{-1, 3, 15, 74},
  	{-1, 4, 1, 91},
  	{-1, 12, 31, 365},
  
  	// 400 BC tests (leap-year)
  	{-400, 1, 1, 1},
  	{-400, 1, 15, 15},
  	{-400, 2, 1, 32},
  	{-400, 2, 15, 46},
  	{-400, 3, 1, 61},
  	{-400, 3, 15, 75},
  	{-400, 4, 1, 92},
  	{-400, 12, 31, 366},
  
  	// Special Cases
  
  	// Gregorian calendar change (no effect)
  	{1582, 10, 4, 277},
  	{1582, 10, 15, 288},
  }
  
  // Check to see if YearDay is location sensitive
  var yearDayLocations = []*Location{
  	FixedZone("UTC-8", -8*60*60),
  	FixedZone("UTC-4", -4*60*60),
  	UTC,
  	FixedZone("UTC+4", 4*60*60),
  	FixedZone("UTC+8", 8*60*60),
  }
  
  func TestYearDay(t *testing.T) {
  	for _, loc := range yearDayLocations {
  		for _, ydt := range yearDayTests {
  			dt := Date(ydt.year, Month(ydt.month), ydt.day, 0, 0, 0, 0, loc)
  			yday := dt.YearDay()
  			if yday != ydt.yday {
  				t.Errorf("got %d, expected %d for %d-%02d-%02d in %v",
  					yday, ydt.yday, ydt.year, ydt.month, ydt.day, loc)
  			}
  		}
  	}
  }
  
  var durationTests = []struct {
  	str string
  	d   Duration
  }{
  	{"0s", 0},
  	{"1ns", 1 * Nanosecond},
  	{"1.1µs", 1100 * Nanosecond},
  	{"2.2ms", 2200 * Microsecond},
  	{"3.3s", 3300 * Millisecond},
  	{"4m5s", 4*Minute + 5*Second},
  	{"4m5.001s", 4*Minute + 5001*Millisecond},
  	{"5h6m7.001s", 5*Hour + 6*Minute + 7001*Millisecond},
  	{"8m0.000000001s", 8*Minute + 1*Nanosecond},
  	{"2562047h47m16.854775807s", 1<<63 - 1},
  	{"-2562047h47m16.854775808s", -1 << 63},
  }
  
  func TestDurationString(t *testing.T) {
  	for _, tt := range durationTests {
  		if str := tt.d.String(); str != tt.str {
  			t.Errorf("Duration(%d).String() = %s, want %s", int64(tt.d), str, tt.str)
  		}
  		if tt.d > 0 {
  			if str := (-tt.d).String(); str != "-"+tt.str {
  				t.Errorf("Duration(%d).String() = %s, want %s", int64(-tt.d), str, "-"+tt.str)
  			}
  		}
  	}
  }
  
  var dateTests = []struct {
  	year, month, day, hour, min, sec, nsec int
  	z                                      *Location
  	unix                                   int64
  }{
  	{2011, 11, 6, 1, 0, 0, 0, Local, 1320566400},   // 1:00:00 PDT
  	{2011, 11, 6, 1, 59, 59, 0, Local, 1320569999}, // 1:59:59 PDT
  	{2011, 11, 6, 2, 0, 0, 0, Local, 1320573600},   // 2:00:00 PST
  
  	{2011, 3, 13, 1, 0, 0, 0, Local, 1300006800},   // 1:00:00 PST
  	{2011, 3, 13, 1, 59, 59, 0, Local, 1300010399}, // 1:59:59 PST
  	{2011, 3, 13, 3, 0, 0, 0, Local, 1300010400},   // 3:00:00 PDT
  	{2011, 3, 13, 2, 30, 0, 0, Local, 1300008600},  // 2:30:00 PDT ≡ 1:30 PST
  
  	// Many names for Fri Nov 18 7:56:35 PST 2011
  	{2011, 11, 18, 7, 56, 35, 0, Local, 1321631795},                 // Nov 18 7:56:35
  	{2011, 11, 19, -17, 56, 35, 0, Local, 1321631795},               // Nov 19 -17:56:35
  	{2011, 11, 17, 31, 56, 35, 0, Local, 1321631795},                // Nov 17 31:56:35
  	{2011, 11, 18, 6, 116, 35, 0, Local, 1321631795},                // Nov 18 6:116:35
  	{2011, 10, 49, 7, 56, 35, 0, Local, 1321631795},                 // Oct 49 7:56:35
  	{2011, 11, 18, 7, 55, 95, 0, Local, 1321631795},                 // Nov 18 7:55:95
  	{2011, 11, 18, 7, 56, 34, 1e9, Local, 1321631795},               // Nov 18 7:56:34 + 10⁹ns
  	{2011, 12, -12, 7, 56, 35, 0, Local, 1321631795},                // Dec -21 7:56:35
  	{2012, 1, -43, 7, 56, 35, 0, Local, 1321631795},                 // Jan -52 7:56:35 2012
  	{2012, int(January - 2), 18, 7, 56, 35, 0, Local, 1321631795},   // (Jan-2) 18 7:56:35 2012
  	{2010, int(December + 11), 18, 7, 56, 35, 0, Local, 1321631795}, // (Dec+11) 18 7:56:35 2010
  }
  
  func TestDate(t *testing.T) {
  	for _, tt := range dateTests {
  		time := Date(tt.year, Month(tt.month), tt.day, tt.hour, tt.min, tt.sec, tt.nsec, tt.z)
  		want := Unix(tt.unix, 0)
  		if !time.Equal(want) {
  			t.Errorf("Date(%d, %d, %d, %d, %d, %d, %d, %s) = %v, want %v",
  				tt.year, tt.month, tt.day, tt.hour, tt.min, tt.sec, tt.nsec, tt.z,
  				time, want)
  		}
  	}
  }
  
  // Several ways of getting from
  // Fri Nov 18 7:56:35 PST 2011
  // to
  // Thu Mar 19 7:56:35 PST 2016
  var addDateTests = []struct {
  	years, months, days int
  }{
  	{4, 4, 1},
  	{3, 16, 1},
  	{3, 15, 30},
  	{5, -6, -18 - 30 - 12},
  }
  
  func TestAddDate(t *testing.T) {
  	t0 := Date(2011, 11, 18, 7, 56, 35, 0, UTC)
  	t1 := Date(2016, 3, 19, 7, 56, 35, 0, UTC)
  	for _, at := range addDateTests {
  		time := t0.AddDate(at.years, at.months, at.days)
  		if !time.Equal(t1) {
  			t.Errorf("AddDate(%d, %d, %d) = %v, want %v",
  				at.years, at.months, at.days,
  				time, t1)
  		}
  	}
  }
  
  var daysInTests = []struct {
  	year, month, di int
  }{
  	{2011, 1, 31},  // January, first month, 31 days
  	{2011, 2, 28},  // February, non-leap year, 28 days
  	{2012, 2, 29},  // February, leap year, 29 days
  	{2011, 6, 30},  // June, 30 days
  	{2011, 12, 31}, // December, last month, 31 days
  }
  
  func TestDaysIn(t *testing.T) {
  	// The daysIn function is not exported.
  	// Test the daysIn function via the `var DaysIn = daysIn`
  	// statement in the internal_test.go file.
  	for _, tt := range daysInTests {
  		di := DaysIn(Month(tt.month), tt.year)
  		if di != tt.di {
  			t.Errorf("got %d; expected %d for %d-%02d",
  				di, tt.di, tt.year, tt.month)
  		}
  	}
  }
  
  func TestAddToExactSecond(t *testing.T) {
  	// Add an amount to the current time to round it up to the next exact second.
  	// This test checks that the nsec field still lies within the range [0, 999999999].
  	t1 := Now()
  	t2 := t1.Add(Second - Duration(t1.Nanosecond()))
  	sec := (t1.Second() + 1) % 60
  	if t2.Second() != sec || t2.Nanosecond() != 0 {
  		t.Errorf("sec = %d, nsec = %d, want sec = %d, nsec = 0", t2.Second(), t2.Nanosecond(), sec)
  	}
  }
  
  func equalTimeAndZone(a, b Time) bool {
  	aname, aoffset := a.Zone()
  	bname, boffset := b.Zone()
  	return a.Equal(b) && aoffset == boffset && aname == bname
  }
  
  var gobTests = []Time{
  	Date(0, 1, 2, 3, 4, 5, 6, UTC),
  	Date(7, 8, 9, 10, 11, 12, 13, FixedZone("", 0)),
  	Unix(81985467080890095, 0x76543210), // Time.sec: 0x0123456789ABCDEF
  	{}, // nil location
  	Date(1, 2, 3, 4, 5, 6, 7, FixedZone("", 32767*60)),
  	Date(1, 2, 3, 4, 5, 6, 7, FixedZone("", -32768*60)),
  }
  
  func TestTimeGob(t *testing.T) {
  	var b bytes.Buffer
  	enc := gob.NewEncoder(&b)
  	dec := gob.NewDecoder(&b)
  	for _, tt := range gobTests {
  		var gobtt Time
  		if err := enc.Encode(&tt); err != nil {
  			t.Errorf("%v gob Encode error = %q, want nil", tt, err)
  		} else if err := dec.Decode(&gobtt); err != nil {
  			t.Errorf("%v gob Decode error = %q, want nil", tt, err)
  		} else if !equalTimeAndZone(gobtt, tt) {
  			t.Errorf("Decoded time = %v, want %v", gobtt, tt)
  		}
  		b.Reset()
  	}
  }
  
  var invalidEncodingTests = []struct {
  	bytes []byte
  	want  string
  }{
  	{[]byte{}, "Time.UnmarshalBinary: no data"},
  	{[]byte{0, 2, 3}, "Time.UnmarshalBinary: unsupported version"},
  	{[]byte{1, 2, 3}, "Time.UnmarshalBinary: invalid length"},
  }
  
  func TestInvalidTimeGob(t *testing.T) {
  	for _, tt := range invalidEncodingTests {
  		var ignored Time
  		err := ignored.GobDecode(tt.bytes)
  		if err == nil || err.Error() != tt.want {
  			t.Errorf("time.GobDecode(%#v) error = %v, want %v", tt.bytes, err, tt.want)
  		}
  		err = ignored.UnmarshalBinary(tt.bytes)
  		if err == nil || err.Error() != tt.want {
  			t.Errorf("time.UnmarshalBinary(%#v) error = %v, want %v", tt.bytes, err, tt.want)
  		}
  	}
  }
  
  var notEncodableTimes = []struct {
  	time Time
  	want string
  }{
  	{Date(0, 1, 2, 3, 4, 5, 6, FixedZone("", 1)), "Time.MarshalBinary: zone offset has fractional minute"},
  	{Date(0, 1, 2, 3, 4, 5, 6, FixedZone("", -1*60)), "Time.MarshalBinary: unexpected zone offset"},
  	{Date(0, 1, 2, 3, 4, 5, 6, FixedZone("", -32769*60)), "Time.MarshalBinary: unexpected zone offset"},
  	{Date(0, 1, 2, 3, 4, 5, 6, FixedZone("", 32768*60)), "Time.MarshalBinary: unexpected zone offset"},
  }
  
  func TestNotGobEncodableTime(t *testing.T) {
  	for _, tt := range notEncodableTimes {
  		_, err := tt.time.GobEncode()
  		if err == nil || err.Error() != tt.want {
  			t.Errorf("%v GobEncode error = %v, want %v", tt.time, err, tt.want)
  		}
  		_, err = tt.time.MarshalBinary()
  		if err == nil || err.Error() != tt.want {
  			t.Errorf("%v MarshalBinary error = %v, want %v", tt.time, err, tt.want)
  		}
  	}
  }
  
  var jsonTests = []struct {
  	time Time
  	json string
  }{
  	{Date(9999, 4, 12, 23, 20, 50, 520*1e6, UTC), `"9999-04-12T23:20:50.52Z"`},
  	{Date(1996, 12, 19, 16, 39, 57, 0, Local), `"1996-12-19T16:39:57-08:00"`},
  	{Date(0, 1, 1, 0, 0, 0, 1, FixedZone("", 1*60)), `"0000-01-01T00:00:00.000000001+00:01"`},
  }
  
  func TestTimeJSON(t *testing.T) {
  	for _, tt := range jsonTests {
  		var jsonTime Time
  
  		if jsonBytes, err := json.Marshal(tt.time); err != nil {
  			t.Errorf("%v json.Marshal error = %v, want nil", tt.time, err)
  		} else if string(jsonBytes) != tt.json {
  			t.Errorf("%v JSON = %#q, want %#q", tt.time, string(jsonBytes), tt.json)
  		} else if err = json.Unmarshal(jsonBytes, &jsonTime); err != nil {
  			t.Errorf("%v json.Unmarshal error = %v, want nil", tt.time, err)
  		} else if !equalTimeAndZone(jsonTime, tt.time) {
  			t.Errorf("Unmarshaled time = %v, want %v", jsonTime, tt.time)
  		}
  	}
  }
  
  func TestInvalidTimeJSON(t *testing.T) {
  	var tt Time
  	err := json.Unmarshal([]byte(`{"now is the time":"buddy"}`), &tt)
  	_, isParseErr := err.(*ParseError)
  	if !isParseErr {
  		t.Errorf("expected *time.ParseError unmarshaling JSON, got %v", err)
  	}
  }
  
  var notJSONEncodableTimes = []struct {
  	time Time
  	want string
  }{
  	{Date(10000, 1, 1, 0, 0, 0, 0, UTC), "Time.MarshalJSON: year outside of range [0,9999]"},
  	{Date(-1, 1, 1, 0, 0, 0, 0, UTC), "Time.MarshalJSON: year outside of range [0,9999]"},
  }
  
  func TestNotJSONEncodableTime(t *testing.T) {
  	for _, tt := range notJSONEncodableTimes {
  		_, err := tt.time.MarshalJSON()
  		if err == nil || err.Error() != tt.want {
  			t.Errorf("%v MarshalJSON error = %v, want %v", tt.time, err, tt.want)
  		}
  	}
  }
  
  var parseDurationTests = []struct {
  	in   string
  	ok   bool
  	want Duration
  }{
  	// simple
  	{"0", true, 0},
  	{"5s", true, 5 * Second},
  	{"30s", true, 30 * Second},
  	{"1478s", true, 1478 * Second},
  	// sign
  	{"-5s", true, -5 * Second},
  	{"+5s", true, 5 * Second},
  	{"-0", true, 0},
  	{"+0", true, 0},
  	// decimal
  	{"5.0s", true, 5 * Second},
  	{"5.6s", true, 5*Second + 600*Millisecond},
  	{"5.s", true, 5 * Second},
  	{".5s", true, 500 * Millisecond},
  	{"1.0s", true, 1 * Second},
  	{"1.00s", true, 1 * Second},
  	{"1.004s", true, 1*Second + 4*Millisecond},
  	{"1.0040s", true, 1*Second + 4*Millisecond},
  	{"100.00100s", true, 100*Second + 1*Millisecond},
  	// different units
  	{"10ns", true, 10 * Nanosecond},
  	{"11us", true, 11 * Microsecond},
  	{"12µs", true, 12 * Microsecond}, // U+00B5
  	{"12μs", true, 12 * Microsecond}, // U+03BC
  	{"13ms", true, 13 * Millisecond},
  	{"14s", true, 14 * Second},
  	{"15m", true, 15 * Minute},
  	{"16h", true, 16 * Hour},
  	// composite durations
  	{"3h30m", true, 3*Hour + 30*Minute},
  	{"10.5s4m", true, 4*Minute + 10*Second + 500*Millisecond},
  	{"-2m3.4s", true, -(2*Minute + 3*Second + 400*Millisecond)},
  	{"1h2m3s4ms5us6ns", true, 1*Hour + 2*Minute + 3*Second + 4*Millisecond + 5*Microsecond + 6*Nanosecond},
  	{"39h9m14.425s", true, 39*Hour + 9*Minute + 14*Second + 425*Millisecond},
  	// large value
  	{"52763797000ns", true, 52763797000 * Nanosecond},
  	// more than 9 digits after decimal point, see https://golang.org/issue/6617
  	{"0.3333333333333333333h", true, 20 * Minute},
  	// 9007199254740993 = 1<<53+1 cannot be stored precisely in a float64
  	{"9007199254740993ns", true, (1<<53 + 1) * Nanosecond},
  	// largest duration that can be represented by int64 in nanoseconds
  	{"9223372036854775807ns", true, (1<<63 - 1) * Nanosecond},
  	{"9223372036854775.807us", true, (1<<63 - 1) * Nanosecond},
  	{"9223372036s854ms775us807ns", true, (1<<63 - 1) * Nanosecond},
  	// large negative value
  	{"-9223372036854775807ns", true, -1<<63 + 1*Nanosecond},
  	// huge string; issue 15011.
  	{"0.100000000000000000000h", true, 6 * Minute},
  	// This value tests the first overflow check in leadingFraction.
  	{"0.830103483285477580700h", true, 49*Minute + 48*Second + 372539827*Nanosecond},
  
  	// errors
  	{"", false, 0},
  	{"3", false, 0},
  	{"-", false, 0},
  	{"s", false, 0},
  	{".", false, 0},
  	{"-.", false, 0},
  	{".s", false, 0},
  	{"+.s", false, 0},
  	{"3000000h", false, 0},                  // overflow
  	{"9223372036854775808ns", false, 0},     // overflow
  	{"9223372036854775.808us", false, 0},    // overflow
  	{"9223372036854ms775us808ns", false, 0}, // overflow
  	// largest negative value of type int64 in nanoseconds should fail
  	// see https://go-review.googlesource.com/#/c/2461/
  	{"-9223372036854775808ns", false, 0},
  }
  
  func TestParseDuration(t *testing.T) {
  	for _, tc := range parseDurationTests {
  		d, err := ParseDuration(tc.in)
  		if tc.ok && (err != nil || d != tc.want) {
  			t.Errorf("ParseDuration(%q) = %v, %v, want %v, nil", tc.in, d, err, tc.want)
  		} else if !tc.ok && err == nil {
  			t.Errorf("ParseDuration(%q) = _, nil, want _, non-nil", tc.in)
  		}
  	}
  }
  
  func TestParseDurationRoundTrip(t *testing.T) {
  	for i := 0; i < 100; i++ {
  		// Resolutions finer than milliseconds will result in
  		// imprecise round-trips.
  		d0 := Duration(rand.Int31()) * Millisecond
  		s := d0.String()
  		d1, err := ParseDuration(s)
  		if err != nil || d0 != d1 {
  			t.Errorf("round-trip failed: %d => %q => %d, %v", d0, s, d1, err)
  		}
  	}
  }
  
  // golang.org/issue/4622
  func TestLocationRace(t *testing.T) {
  	ResetLocalOnceForTest() // reset the Once to trigger the race
  
  	c := make(chan string, 1)
  	go func() {
  		c <- Now().String()
  	}()
  	_ = Now().String()
  	<-c
  	Sleep(100 * Millisecond)
  
  	// Back to Los Angeles for subsequent tests:
  	ForceUSPacificForTesting()
  }
  
  var (
  	t Time
  	u int64
  )
  
  var mallocTest = []struct {
  	count int
  	desc  string
  	fn    func()
  }{
  	{0, `time.Now()`, func() { t = Now() }},
  	{0, `time.Now().UnixNano()`, func() { u = Now().UnixNano() }},
  }
  
  func TestCountMallocs(t *testing.T) {
  	if testing.Short() {
  		t.Skip("skipping malloc count in short mode")
  	}
  	if runtime.GOMAXPROCS(0) > 1 {
  		t.Skip("skipping; GOMAXPROCS>1")
  	}
  	for _, mt := range mallocTest {
  		allocs := int(testing.AllocsPerRun(100, mt.fn))
  		if allocs > mt.count {
  			t.Errorf("%s: %d allocs, want %d", mt.desc, allocs, mt.count)
  		}
  	}
  }
  
  func TestLoadFixed(t *testing.T) {
  	// Issue 4064: handle locations without any zone transitions.
  	loc, err := LoadLocation("Etc/GMT+1")
  	if err != nil {
  		t.Fatal(err)
  	}
  
  	// The tzdata name Etc/GMT+1 uses "east is negative",
  	// but Go and most other systems use "east is positive".
  	// So GMT+1 corresponds to -3600 in the Go zone, not +3600.
  	name, offset := Now().In(loc).Zone()
  	// The zone abbreviation is "-01" since tzdata-2016g, and "GMT+1"
  	// on earlier versions; we accept both. (Issue #17276).
  	if !(name == "GMT+1" || name == "-01") || offset != -1*60*60 {
  		t.Errorf("Now().In(loc).Zone() = %q, %d, want %q or %q, %d",
  			name, offset, "GMT+1", "-01", -1*60*60)
  	}
  }
  
  const (
  	minDuration Duration = -1 << 63
  	maxDuration Duration = 1<<63 - 1
  )
  
  var subTests = []struct {
  	t Time
  	u Time
  	d Duration
  }{
  	{Time{}, Time{}, Duration(0)},
  	{Date(2009, 11, 23, 0, 0, 0, 1, UTC), Date(2009, 11, 23, 0, 0, 0, 0, UTC), Duration(1)},
  	{Date(2009, 11, 23, 0, 0, 0, 0, UTC), Date(2009, 11, 24, 0, 0, 0, 0, UTC), -24 * Hour},
  	{Date(2009, 11, 24, 0, 0, 0, 0, UTC), Date(2009, 11, 23, 0, 0, 0, 0, UTC), 24 * Hour},
  	{Date(-2009, 11, 24, 0, 0, 0, 0, UTC), Date(-2009, 11, 23, 0, 0, 0, 0, UTC), 24 * Hour},
  	{Time{}, Date(2109, 11, 23, 0, 0, 0, 0, UTC), Duration(minDuration)},
  	{Date(2109, 11, 23, 0, 0, 0, 0, UTC), Time{}, Duration(maxDuration)},
  	{Time{}, Date(-2109, 11, 23, 0, 0, 0, 0, UTC), Duration(maxDuration)},
  	{Date(-2109, 11, 23, 0, 0, 0, 0, UTC), Time{}, Duration(minDuration)},
  	{Date(2290, 1, 1, 0, 0, 0, 0, UTC), Date(2000, 1, 1, 0, 0, 0, 0, UTC), 290*365*24*Hour + 71*24*Hour},
  	{Date(2300, 1, 1, 0, 0, 0, 0, UTC), Date(2000, 1, 1, 0, 0, 0, 0, UTC), Duration(maxDuration)},
  	{Date(2000, 1, 1, 0, 0, 0, 0, UTC), Date(2290, 1, 1, 0, 0, 0, 0, UTC), -290*365*24*Hour - 71*24*Hour},
  	{Date(2000, 1, 1, 0, 0, 0, 0, UTC), Date(2300, 1, 1, 0, 0, 0, 0, UTC), Duration(minDuration)},
  }
  
  func TestSub(t *testing.T) {
  	for i, st := range subTests {
  		got := st.t.Sub(st.u)
  		if got != st.d {
  			t.Errorf("#%d: Sub(%v, %v): got %v; want %v", i, st.t, st.u, got, st.d)
  		}
  	}
  }
  
  var nsDurationTests = []struct {
  	d    Duration
  	want int64
  }{
  	{Duration(-1000), -1000},
  	{Duration(-1), -1},
  	{Duration(1), 1},
  	{Duration(1000), 1000},
  }
  
  func TestDurationNanoseconds(t *testing.T) {
  	for _, tt := range nsDurationTests {
  		if got := tt.d.Nanoseconds(); got != tt.want {
  			t.Errorf("d.Nanoseconds() = %d; want: %d", got, tt.want)
  		}
  	}
  }
  
  var secDurationTests = []struct {
  	d    Duration
  	want float64
  }{
  	{Duration(300000000), 0.3},
  }
  
  func TestDurationSeconds(t *testing.T) {
  	for _, tt := range secDurationTests {
  		if got := tt.d.Seconds(); got != tt.want {
  			t.Errorf("d.Seconds() = %g; want: %g", got, tt.want)
  		}
  	}
  }
  
  var minDurationTests = []struct {
  	d    Duration
  	want float64
  }{
  	{Duration(-60000000000), -1},
  	{Duration(-1), -1 / 60e9},
  	{Duration(1), 1 / 60e9},
  	{Duration(60000000000), 1},
  	{Duration(3000), 5e-8},
  }
  
  func TestDurationMinutes(t *testing.T) {
  	for _, tt := range minDurationTests {
  		if got := tt.d.Minutes(); got != tt.want {
  			t.Errorf("d.Minutes() = %g; want: %g", got, tt.want)
  		}
  	}
  }
  
  var hourDurationTests = []struct {
  	d    Duration
  	want float64
  }{
  	{Duration(-3600000000000), -1},
  	{Duration(-1), -1 / 3600e9},
  	{Duration(1), 1 / 3600e9},
  	{Duration(3600000000000), 1},
  	{Duration(36), 1e-11},
  }
  
  func TestDurationHours(t *testing.T) {
  	for _, tt := range hourDurationTests {
  		if got := tt.d.Hours(); got != tt.want {
  			t.Errorf("d.Hours() = %g; want: %g", got, tt.want)
  		}
  	}
  }
  
  var durationTruncateTests = []struct {
  	d    Duration
  	m    Duration
  	want Duration
  }{
  	{0, Second, 0},
  	{Minute, -7 * Second, Minute},
  	{Minute, 0, Minute},
  	{Minute, 1, Minute},
  	{Minute + 10*Second, 10 * Second, Minute + 10*Second},
  	{2*Minute + 10*Second, Minute, 2 * Minute},
  	{10*Minute + 10*Second, 3 * Minute, 9 * Minute},
  	{Minute + 10*Second, Minute + 10*Second + 1, 0},
  	{Minute + 10*Second, Hour, 0},
  	{-Minute, Second, -Minute},
  	{-10 * Minute, 3 * Minute, -9 * Minute},
  	{-10 * Minute, Hour, 0},
  }
  
  func TestDurationTruncate(t *testing.T) {
  	for _, tt := range durationTruncateTests {
  		if got := tt.d.Truncate(tt.m); got != tt.want {
  			t.Errorf("Duration(%s).Truncate(%s) = %s; want: %s", tt.d, tt.m, got, tt.want)
  		}
  	}
  }
  
  var durationRoundTests = []struct {
  	d    Duration
  	m    Duration
  	want Duration
  }{
  	{0, Second, 0},
  	{Minute, -11 * Second, Minute},
  	{Minute, 0, Minute},
  	{Minute, 1, Minute},
  	{2 * Minute, Minute, 2 * Minute},
  	{2*Minute + 10*Second, Minute, 2 * Minute},
  	{2*Minute + 30*Second, Minute, 3 * Minute},
  	{2*Minute + 50*Second, Minute, 3 * Minute},
  	{-Minute, 1, -Minute},
  	{-2 * Minute, Minute, -2 * Minute},
  	{-2*Minute - 10*Second, Minute, -2 * Minute},
  	{-2*Minute - 30*Second, Minute, -3 * Minute},
  	{-2*Minute - 50*Second, Minute, -3 * Minute},
  	{8e18, 3e18, 9e18},
  	{9e18, 5e18, 1<<63 - 1},
  	{-8e18, 3e18, -9e18},
  	{-9e18, 5e18, -1 << 63},
  	{3<<61 - 1, 3 << 61, 3 << 61},
  }
  
  func TestDurationRound(t *testing.T) {
  	for _, tt := range durationRoundTests {
  		if got := tt.d.Round(tt.m); got != tt.want {
  			t.Errorf("Duration(%s).Round(%s) = %s; want: %s", tt.d, tt.m, got, tt.want)
  		}
  	}
  }
  
  var defaultLocTests = []struct {
  	name string
  	f    func(t1, t2 Time) bool
  }{
  	{"After", func(t1, t2 Time) bool { return t1.After(t2) == t2.After(t1) }},
  	{"Before", func(t1, t2 Time) bool { return t1.Before(t2) == t2.Before(t1) }},
  	{"Equal", func(t1, t2 Time) bool { return t1.Equal(t2) == t2.Equal(t1) }},
  
  	{"IsZero", func(t1, t2 Time) bool { return t1.IsZero() == t2.IsZero() }},
  	{"Date", func(t1, t2 Time) bool {
  		a1, b1, c1 := t1.Date()
  		a2, b2, c2 := t2.Date()
  		return a1 == a2 && b1 == b2 && c1 == c2
  	}},
  	{"Year", func(t1, t2 Time) bool { return t1.Year() == t2.Year() }},
  	{"Month", func(t1, t2 Time) bool { return t1.Month() == t2.Month() }},
  	{"Day", func(t1, t2 Time) bool { return t1.Day() == t2.Day() }},
  	{"Weekday", func(t1, t2 Time) bool { return t1.Weekday() == t2.Weekday() }},
  	{"ISOWeek", func(t1, t2 Time) bool {
  		a1, b1 := t1.ISOWeek()
  		a2, b2 := t2.ISOWeek()
  		return a1 == a2 && b1 == b2
  	}},
  	{"Clock", func(t1, t2 Time) bool {
  		a1, b1, c1 := t1.Clock()
  		a2, b2, c2 := t2.Clock()
  		return a1 == a2 && b1 == b2 && c1 == c2
  	}},
  	{"Hour", func(t1, t2 Time) bool { return t1.Hour() == t2.Hour() }},
  	{"Minute", func(t1, t2 Time) bool { return t1.Minute() == t2.Minute() }},
  	{"Second", func(t1, t2 Time) bool { return t1.Second() == t2.Second() }},
  	{"Nanosecond", func(t1, t2 Time) bool { return t1.Hour() == t2.Hour() }},
  	{"YearDay", func(t1, t2 Time) bool { return t1.YearDay() == t2.YearDay() }},
  
  	// Using Equal since Add don't modify loc using "==" will cause a fail
  	{"Add", func(t1, t2 Time) bool { return t1.Add(Hour).Equal(t2.Add(Hour)) }},
  	{"Sub", func(t1, t2 Time) bool { return t1.Sub(t2) == t2.Sub(t1) }},
  
  	//Original caus for this test case bug 15852
  	{"AddDate", func(t1, t2 Time) bool { return t1.AddDate(1991, 9, 3) == t2.AddDate(1991, 9, 3) }},
  
  	{"UTC", func(t1, t2 Time) bool { return t1.UTC() == t2.UTC() }},
  	{"Local", func(t1, t2 Time) bool { return t1.Local() == t2.Local() }},
  	{"In", func(t1, t2 Time) bool { return t1.In(UTC) == t2.In(UTC) }},
  
  	{"Local", func(t1, t2 Time) bool { return t1.Local() == t2.Local() }},
  	{"Zone", func(t1, t2 Time) bool {
  		a1, b1 := t1.Zone()
  		a2, b2 := t2.Zone()
  		return a1 == a2 && b1 == b2
  	}},
  
  	{"Unix", func(t1, t2 Time) bool { return t1.Unix() == t2.Unix() }},
  	{"UnixNano", func(t1, t2 Time) bool { return t1.UnixNano() == t2.UnixNano() }},
  
  	{"MarshalBinary", func(t1, t2 Time) bool {
  		a1, b1 := t1.MarshalBinary()
  		a2, b2 := t2.MarshalBinary()
  		return bytes.Equal(a1, a2) && b1 == b2
  	}},
  	{"GobEncode", func(t1, t2 Time) bool {
  		a1, b1 := t1.GobEncode()
  		a2, b2 := t2.GobEncode()
  		return bytes.Equal(a1, a2) && b1 == b2
  	}},
  	{"MarshalJSON", func(t1, t2 Time) bool {
  		a1, b1 := t1.MarshalJSON()
  		a2, b2 := t2.MarshalJSON()
  		return bytes.Equal(a1, a2) && b1 == b2
  	}},
  	{"MarshalText", func(t1, t2 Time) bool {
  		a1, b1 := t1.MarshalText()
  		a2, b2 := t2.MarshalText()
  		return bytes.Equal(a1, a2) && b1 == b2
  	}},
  
  	{"Truncate", func(t1, t2 Time) bool { return t1.Truncate(Hour).Equal(t2.Truncate(Hour)) }},
  	{"Round", func(t1, t2 Time) bool { return t1.Round(Hour).Equal(t2.Round(Hour)) }},
  
  	{"== Time{}", func(t1, t2 Time) bool { return (t1 == Time{}) == (t2 == Time{}) }},
  }
  
  func TestDefaultLoc(t *testing.T) {
  	//This test verifyes that all Time's methods behaves identical if loc is set
  	//as nil or UTC
  	for _, tt := range defaultLocTests {
  		t1 := Time{}
  		t2 := Time{}.UTC()
  		if !tt.f(t1, t2) {
  			t.Errorf("Time{} and Time{}.UTC() behave differently for %s", tt.name)
  		}
  	}
  }
  
  func BenchmarkNow(b *testing.B) {
  	for i := 0; i < b.N; i++ {
  		t = Now()
  	}
  }
  
  func BenchmarkNowUnixNano(b *testing.B) {
  	for i := 0; i < b.N; i++ {
  		u = Now().UnixNano()
  	}
  }
  
  func BenchmarkFormat(b *testing.B) {
  	t := Unix(1265346057, 0)
  	for i := 0; i < b.N; i++ {
  		t.Format("Mon Jan  2 15:04:05 2006")
  	}
  }
  
  func BenchmarkFormatNow(b *testing.B) {
  	// Like BenchmarkFormat, but easier, because the time zone
  	// lookup cache is optimized for the present.
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		t.Format("Mon Jan  2 15:04:05 2006")
  	}
  }
  
  func BenchmarkMarshalJSON(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		t.MarshalJSON()
  	}
  }
  
  func BenchmarkMarshalText(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		t.MarshalText()
  	}
  }
  
  func BenchmarkParse(b *testing.B) {
  	for i := 0; i < b.N; i++ {
  		Parse(ANSIC, "Mon Jan  2 15:04:05 2006")
  	}
  }
  
  func BenchmarkParseDuration(b *testing.B) {
  	for i := 0; i < b.N; i++ {
  		ParseDuration("9007199254.740993ms")
  		ParseDuration("9007199254740993ns")
  	}
  }
  
  func BenchmarkHour(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		_ = t.Hour()
  	}
  }
  
  func BenchmarkSecond(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		_ = t.Second()
  	}
  }
  
  func BenchmarkYear(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		_ = t.Year()
  	}
  }
  
  func BenchmarkDay(b *testing.B) {
  	t := Now()
  	for i := 0; i < b.N; i++ {
  		_ = t.Day()
  	}
  }
  
  func TestMarshalBinaryZeroTime(t *testing.T) {
  	t0 := Time{}
  	enc, err := t0.MarshalBinary()
  	if err != nil {
  		t.Fatal(err)
  	}
  	t1 := Now() // not zero
  	if err := t1.UnmarshalBinary(enc); err != nil {
  		t.Fatal(err)
  	}
  	if t1 != t0 {
  		t.Errorf("t0=%#v\nt1=%#v\nwant identical structures", t0, t1)
  	}
  }
  
  // Issue 17720: Zero value of time.Month fails to print
  func TestZeroMonthString(t *testing.T) {
  	if got, want := Month(0).String(), "%!Month(0)"; got != want {
  		t.Errorf("zero month = %q; want %q", got, want)
  	}
  }
  
  func TestReadFileLimit(t *testing.T) {
  	const zero = "/dev/zero"
  	if _, err := os.Stat(zero); err != nil {
  		t.Skip("skipping test without a /dev/zero")
  	}
  	_, err := ReadFile(zero)
  	if err == nil || !strings.Contains(err.Error(), "is too large") {
  		t.Errorf("readFile(%q) error = %v; want error containing 'is too large'", zero, err)
  	}
  }
  

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