# Source: <https://sources.debian.org/patches/docbook-utils/0.6.14-4/support_source_date_epoch.patch/>

Author: Reiner Herrmann <reiner@reiner-h.de>
Description: Support SOURCE_DATE_EPOCH for timestamps
 To allow generating documents in a reproducible way,
 allow overriding the timestamp through the environment.
 .
 See also: https://reproducible-builds.org/specs/source-date-epoch/
Bug-Debian: https://bugs.debian.org/800797

--- a/helpers/docbook2man-spec.pl
+++ b/helpers/docbook2man-spec.pl
@@ -57,6 +57,7 @@
 use SGMLS;			# Use the SGMLS package.
 use SGMLS::Output;		# Use stack-based output.
 use SGMLS::Refs;
+use POSIX qw(strftime setlocale LC_TIME);
 
 ########################################################################
 # SGMLSPL script produced automatically by the script sgmlspl.pl
@@ -279,6 +280,10 @@
 _END_BANNER
 
 	my $date = `date "+%d %B %Y"`;
+	if ($ENV{SOURCE_DATE_EPOCH}) {
+		setlocale(LC_TIME, "C");
+		$date = strftime("%d %B %Y", gmtime($ENV{SOURCE_DATE_EPOCH} || time));
+	}
 	my $manpage_date = $manpage_date || $date ;
 
 	output '.TH "';
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<div class='path'>path: <a href='/guix/log/?id=68b6f7a2b46dff3039a5e25ce5c570a5543d4388'>root</a>/<a href='/guix/log/po?id=68b6f7a2b46dff3039a5e25ce5c570a5543d4388'>po</a>/<a href='/guix/log/po/packages?id=68b6f7a2b46dff3039a5e25ce5c570a5543d4388'>packages</a>/<a href='/guix/log/po/packages/vi.po?id=68b6f7a2b46dff3039a5e25ce5c570a5543d4388'>vi.po</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/po/packages/vi.po?id=68b6f7a2b46dff3039a5e25ce5c570a5543d4388&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-12-04 22:25:23 +0100'>2022-12-04</span></td><td><a href='/guix/commit/po/packages/vi.po?id=2e75b328b6bbdadbffe5b643a4891b5026a0defd'>nls: Update translations.</a><span class='msg-avail'>...<span class='msg-tooltip'>po/packages/vi.po: New file.
po/packages/LINGUAS: Add it.
</span></span></td><td>Julien Lepiller</td></tr>