Description: Add --build-date command line flag.
 Allow create reproducible documentation passing a unix time in the command
 line.
Author: Juan Picca <jumapico@gmail.com>
Last-Update: 2015-05-16
--- a/T2h_i18n.pm
+++ b/T2h_i18n.pm
@@ -295,7 +295,14 @@ sub pretty_date($)
     my $lang = shift;
     my($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst);
 
-    ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = localtime(time);
+    if (defined $Texi2HTML::Config::BUILD_DATE)
+    {
+        ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = gmtime($Texi2HTML::Config::BUILD_DATE);
+    }
+    else
+    {
+        ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = localtime(time);
+    }
     $year += ($year < 70) ? 2000 : 1900;
     # obachman: Let's do it as the Americans do
     #return($MONTH_NAMES->{$lang}[$mon] . ", " . $mday . " " . $year);
--- a/texi2html.init
+++ b/texi2html.init
@@ -260,6 +260,10 @@ $MONOLITHIC = 1;
 # the specified url are used as stylesheet links
 @CSS_REFS = ();
 
+# -build-date
+# Use the given unix time as build date showing UTC timezone when it is used
+$BUILD_DATE = $ENV{'SOURCE_DATE_EPOCH'};
+
 ######################
 # The following options are only relevant if $L2H is set
 #
--- a/texi2html.pl
+++ b/texi2html.pl
@@ -261,6 +261,7 @@ $EXTERNAL_DIR
 $IGNORE_PREAMBLE_TEXT
 @CSS_FILES
 @CSS_REFS
+$BUILD_DATE
 $INLINE_CONTENTS
 $INLINE_INSERTCOPYING
 );
@@ -2600,6 +2601,13 @@ $T2H_OPTIONS -> {'css-ref'} =
  verbose => 'generate reference to the CSS URL $s'
 };
 
+$T2H_OPTIONS -> {'build-date'} =
+{
+ type => '=i',
+ linkage => \$Texi2HTML::Config::BUILD_DATE,
+ verbose => 'use the given unix time as build date showing UTC timezone when it is used'
+};
+
 $T2H_OPTIONS -> {'transliterate-file-names'} =
 {
  type => '!',
--- a/doc/texi2html.texi
+++ b/doc/texi2html.texi
@@ -523,6 +523,8 @@ Display a short help and exit.
 Be verbose.
 @item @longopt{version}
 Display version information and exit.
+@item @longopt{build-date=@var{unixtime}}
+Use the given unix time as build date showing UTC timezone when it is used.
 @end table
 
 @c --------------------------------------------------------
--- a/doc/texi2html.info
+++ b/doc/texi2html.info
@@ -435,6 +435,9 @@ Miscellaneous general options:
 `--version'
      Display version information and exit.
 
+`--build-date=UNIXTIME'
+     Use the given unix time as build date showing UTC timezone when it is used.
+
 
 File: texi2html.info,  Node: Splitting output,  Next: Output files,  Prev: General options,  Up: Invoking texi2html