Honor SOURCE_DATE_EPOCH when exporting configuration date.
Autoconf-level patch submitted upstream on Wed Apr 13 17:03:23 UTC 2016

--- a/configure
+++ b/configure
@@ -27737,7 +28573,14 @@
 
 
 ## Configuration date
- CONFIG_DATE="`date`"
+ CONFIG_DATE="`date -u`"
+if test -n "$SOURCE_DATE_EPOCH"; then
+  CONFIG_DATE=`date -u -d "@$SOURCE_DATE_EPOCH" 2>/dev/null \
+               || date -u -r "$SOURCE_DATE_EPOCH" 2>/dev/null`
+  if test -z "$CONFIG_DATE"; then
+    as_fn_error $? "malformed SOURCE_DATE_EPOCH" "$LINENO" 5
+  fi
+fi
 
 ## User doing the configuration
  CONFIG_USER="`whoami`@`hostname`"
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<tr><td><span title='2024-05-13 09:11:06 +0100'>2024-05-13</span></td><td><a href='/guix/commit/gnu/packages/sycl.scm?id=cc212af83ef31d15474e26b39425a0261ff43647'>gnu: opensycl: Rename to adaptivecpp and update to 24.02.0.</a><span class='msg-avail'>...</span></td><td>Andy Tai</td></tr>
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