From 69faba79256faeee8d564298855eebe8c5e9c870 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@debian.org>
Date: Fri, 6 Nov 2015 11:40:37 +0000
Subject: Always use UTC times for display

Using localtime is problematic for reproducible builds.  For now, always
use UTC times (gmtime etc.) for display.  (Note that this changes the
semantics of \n[hours] etc., so may need further work.)

Forwarded: no
Last-Update: 2018-03-05

Patch-Name: display-utc-times.patch
---
 src/devices/grohtml/post-html.cpp | 4 ++--
 src/devices/gropdf/gropdf.pl      | 4 ++--
 src/devices/grops/ps.cpp          | 2 +-
 src/roff/troff/input.cpp          | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

--- a/src/devices/grohtml/post-html.cpp.orig	2023-07-06 18:28:18.581223060 +0200
+++ b/src/devices/grohtml/post-html.cpp	2023-07-06 18:32:13.369103205 +0200
@@ -5115,7 +5115,7 @@
       if (do_write_date_comment) {
 	t = current_time();
 	html.begin_comment("CreationDate: ")
-	  .put_string(ctime(&t), strlen(ctime(&t))-1)
+	  .put_string(asctime(gmtime(&t)), strlen(asctime(gmtime(&t)))-1)
 	  .end_comment();
       }

@@ -5240,7 +5240,7 @@
   if (do_write_date_comment) {
     t = current_time();
     html.begin_comment("CreationDate: ")
-      .put_string(ctime(&t), strlen(ctime(&t))-1)
+      .put_string(asctime(gmtime(&t)), strlen(asctime(gmtime(&t)))-1)
       .end_comment();
   }

diff --git a/src/devices/gropdf/gropdf.pl b/src/devices/gropdf/gropdf.pl
index 2ec52d06..134b0962 100644
--- a/src/devices/gropdf/gropdf.pl
+++ b/src/devices/gropdf/gropdf.pl
@@ -280,7 +280,7 @@ elsif (exists($ppsz{$papersz}))
     @defaultmb=@mediabox=(0,0,$ppsz{$papersz}->[0],$ppsz{$papersz}->[1]);
 }
 
-my (@dt)=localtime($ENV{SOURCE_DATE_EPOCH} || time);
+my (@dt)=gmtime($ENV{SOURCE_DATE_EPOCH} || time);
 my $dt=PDFDate(\@dt);
 
 my %info=('Creator' => "(groff version $cfg{GROFF_VERSION})",
@@ -538,7 +538,7 @@ sub GetObj
 sub PDFDate
 {
     my $dt=shift;
-    return(sprintf("D:%04d%02d%02d%02d%02d%02d%+03d'00'",$dt->[5]+1900,$dt->[4]+1,$dt->[3],$dt->[2],$dt->[1],$dt->[0],( localtime time() + 3600*( 12 - (gmtime)[2] ) )[2] - 12));
+    return(sprintf("D:%04d%02d%02d%02d%02d%02d+00'00'",$dt->[5]+1900,$dt->[4]+1,$dt->[3],$dt->[2],$dt->[1],$dt->[0]));
 }
 
 sub ToPoints
diff --git a/src/devices/grops/ps.cpp b/src/devices/grops/ps.cpp
index ab3b1d73..b0fb78e1 100644
--- a/src/devices/grops/ps.cpp
+++ b/src/devices/grops/ps.cpp
@@ -1392,7 +1392,7 @@ ps_printer::~ps_printer()
     time_t
 #endif
     t = current_time();
-    fputs(ctime(&t), out.get_file());
+    fputs(asctime(gmtime(&t)), out.get_file());
   }
   for (font_pointer_list *f = font_list; f; f = f->next) {
     ps_font *psf = (ps_font *)(f->p);
--- a/src/roff/troff/input.cpp.orig	2023-07-06 18:35:52.483568895 +0200
+++ b/src/roff/troff/input.cpp	2023-07-06 18:39:50.864850588 +0200
@@ -8303,7 +8303,7 @@
   time_t
 #endif /* not LONG_FOR_TIME_T */
     t = current_time();
-  struct tm *tt = localtime(&t);
+    struct tm *tt = gmtime(&t);
   set_number_reg("seconds", int(tt->tm_sec));
   set_number_reg("minutes", int(tt->tm_min));
   set_number_reg("hours", int(tt->tm_hour));