Replaced bash %()T printf (which requires 4.2) with date

Bash 4.2 is still relatively new.

processor

@@ -47,10 +47,10 @@ lasthash=
 while read hash commit ts id subject; do
   echo "[HTML] Found $commit: $subject" >&2
 
-  dateout="$( printf "%(%Y-%m-%d)T" "$ts" )"
+  dateout="$( ./tsdate "$ts" %Y-%m-%d )"
   dategroup="${dateout%-*}"
   day="${dateout##*-}"
-  month="$( printf "%(%m)T" "$ts" )"
+  month="$( ./tsdate "$ts" %m )"
   year="${dateout%%-*}"
 
   # commits are ordered by date desc
@@ -97,7 +97,7 @@ cat <<EOF
       <hr />
       <footer>
         <div>Copyright &copy; $yearrange $copyright</div>
-        <div>Last Updated: $( printf "%(%F %H:%M:%S)T" "$lastts" )</div>
+        <div>Last Updated: $( ./tsdate "$lastts" '%F %H:%M:%S' )</div>
         <div>$lasthash</div>
       </footer>
     </body>

rss

@@ -46,8 +46,12 @@ while read hash commit ts id subject; do
   cat <<EOE
     <item>
       <title><![CDATA[$( ./msgfmt < <( echo "$subject"; echo ) )]]></title>
-      <link>$( printf "%s/%(%Y/%m)T/%s.html" "${url/%\/}" "$ts" "$id" )</link>
-      <pubDate>$( printf "%(%Y-%m-%dT%H:%M:%S%z)T" "$ts" )</pubDate>
+      <link>$(
+        printf "%s/%s/%s.html" \
+          "${url/%\/}" "$( ./tsdate "$ts" %y/%m )" "$id"
+        )
+      </link>
+      <pubDate>$( ./tsdate "$ts" %Y-%m-%d )</pubDate>
       <description>
         <![CDATA[
           $( ./"$repotype"/commit2html "$commit" )

tsdate

@@ -0,0 +1,28 @@
+#!/bin/bash
+#
+# Formats a UNIX timestamp
+#
+#  Copyright (C) 2012  Mike Gerwitz
+#
+#  This file is part of repo2html.
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# #
+
+ts="${1?Missing timestamp}"
+fmt="${2?Missing format specifier}"
+
+# a UNIX timestamp represents the number of seconds since midnight on 1 Jan
+# 1970, UTC
+date --date="1970-01-01 $ts sec UTC" +"$fmt"