Re: [PATCH v2] pretty: Provide a strict ISO8601 date format

[Junio C Hamano <gitster@pobox.com>]

Beat Bolli <bbolli@ewanet.ch> writes:

> Subject: Re: [PATCH v2] pretty: Provide a strict ISO8601 date format

"pretty: add --date=iso-strict, a strict ISO-8601 date format"

> The differences between the two formats are the following:

"The --date=iso format Git uses deviates from ISO-8601 in these
ways" may make it clear which one has "T" and which doesn't.

>   - a space instead of the `T` date/time delimiter
>   - a space between time and time zone
>   - no colon between hours and minutes of the time zone

> This commit adds a strict ISO 8601 date format for displaying committer
> and author dates. It uses the '%aI' and '%cI' format specifiers (note
> the uppercase 'I') and the '--date=iso-strict' or
> '--date=iso8601-strict' date format names.

"Add a .... author dates. Use '%aI' and '%cI' format specifiers ...".

> See http://thread.gmane.org/gmane.comp.version-control.git/255879 and
> http://thread.gmane.org/gmane.comp.version-control.git/52414/focus=52585
> for discussion.

Thanks for the pointers, especially for the older one.

> +	else if (mode == DATE_ISO8601_STRICT) {
> +		char sign = (tz >= 0) ? '+' : '-';
> +		tz = abs(tz);
> +		strbuf_addf(&timebuf, "%04d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d",
> +				tm->tm_year + 1900,
> +				tm->tm_mon + 1,
> +				tm->tm_mday,
> +				tm->tm_hour, tm->tm_min, tm->tm_sec,
> +				sign, tz / 100, tz % 100);

OK.

> +# ISO strict date format
> +test_expect_success 'ISO and ISO-strict date formats display the same values' '
> +	git log --format=%ai%n%ci | sed -e "s/ /T/; s/ //; s/..\$/:&/" >expected &&
> +	git log --format=%aI%n%cI >actual &&
> +	test_cmp expected actual
> +'

This is saying that as long as --date=iso-strict format is
bug-to-bug compatible with --date=iso format it is OK.

Which is fine, especially knowing the implementation ;-)

> +
>  # get new digests (with no abbreviations)
>  head1=$(git rev-parse --verify HEAD~0) &&
>  head2=$(git rev-parse --verify HEAD~1) &&