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time: ParseTime layouts with underscores _ #21966

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FlorianUekermann opened this issue Sep 21, 2017 · 2 comments
Closed

time: ParseTime layouts with underscores _ #21966

FlorianUekermann opened this issue Sep 21, 2017 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Go1.10

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@FlorianUekermann
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I suspect this has been mentioned before, but my searches came up empty.

https://play.golang.org/p/p9ZqFEcoJi

This fmt.Println(time.Parse("2006-_1-_2", "2017-7-17")) fails with this 0001-01-01 00:00:00 +0000 UTC parsing time "2017-7-17" as "2006-_1-_2": cannot parse "7-17" as "-_" output.

I naively expected _-parsing to be less greedy. I'm not sure if this is supposed to work, but maybe it is worth fixing anyway.
@ianlancetaylor ianlancetaylor added this to the Go1.10 milestone Sep 21, 2017
@ianlancetaylor ianlancetaylor added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 21, 2017
@robpike
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robpike commented Sep 22, 2017

"Within the format string, an underscore _ represents a space that may be replaced by a digit if the following number (a day) has two digits; for compatibility with fixed-width Unix time formats."

I read that as "working as intended."

@FlorianUekermann
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I misunderstood the meaning of the word space here. Sorry about that. That was a bit stupid, the docs are actually quite clear. Just removing the underscores has the desired effect.

@golang golang locked and limited conversation to collaborators Sep 22, 2018
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