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Is this expected? time.Now().Before(time.Unix(2<<62 - 1, 0)) = false #39477

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keenangebze opened this issue Jun 9, 2020 · 2 comments
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Is this expected? time.Now().Before(time.Unix(2<<62 - 1, 0)) = false #39477

keenangebze opened this issue Jun 9, 2020 · 2 comments
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@keenangebze
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What version of Go are you using (go version)?

$ go version
go version go1.12.4 linux/amd64

Does this issue reproduce with the latest release?

Not yet tested

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/nakama/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/nakama/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build340274852=/tmp/go-build -gno-record-gcc-switches"

What did you do?

package main

import (
        "fmt"
        "time"
)

func main() {
        today := time.Now()
        future := time.Unix(2<<62 - 1, 0)

        fmt.Println(today, future)
        fmt.Println(today.Before(future))
}

What did you expect to see?

2020-06-09 21:40:19.250234793 +0700 WIB m=+0.000164020 292277026596-12-04 22:30:07 +0700 WIB
true

What did you see instead?

2020-06-09 21:40:19.250234793 +0700 WIB m=+0.000164020 292277026596-12-04 22:30:07 +0700 WIB
false
@seankhliao
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https://golang.org/pkg/time/#Unix

Not all sec values have a corresponding time value. One such value is 1<<63-1 (the largest int64 value).

@ALTree
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ALTree commented Jun 9, 2020 •
edited

What @seankhliao said. Note that 2<<62 == 1<<63. Closing here, since this is working as documented.

@ALTree ALTree closed this as completed Jun 9, 2020
@golang golang locked and limited conversation to collaborators Jun 9, 2021
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@ALTree @gopherbot @seankhliao @keenangebze