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`"
type='hidden' name='id' value='bca1c45e4e23eb90a835f29876267e69a0f0bcb1'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>refs</a><a class='active' href='/guix/log/gnu/tests/ldap.scm'>log</a><a href='/guix/tree/gnu/tests/ldap.scm?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>tree</a><a href='/guix/commit/gnu/tests/ldap.scm?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>commit</a><a href='/guix/diff/gnu/tests/ldap.scm?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests/ldap.scm'>
<input type='hidden' name='id' value='bca1c45e4e23eb90a835f29876267e69a0f0bcb1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>root</a>/<a href='/guix/log/gnu?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>gnu</a>/<a href='/guix/log/gnu/tests?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>tests</a>/<a href='/guix/log/gnu/tests/ldap.scm?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1'>ldap.scm</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/gnu/tests/ldap.scm?id=bca1c45e4e23eb90a835f29876267e69a0f0bcb1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-20 20:31:15 +0100'>2019-03-20</span></td><td><a href='/guix/commit/gnu/tests/ldap.scm?id=c16423f143919916a5273761d7ed29bd49f14519'>services: Add nslcd-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/authentication.scm (nslcd-service-type, nslcd-configuration,
%nslcd-accounts): New variables.
(uglify-field-name, value-&gt;string, serialize-field, serialize-list,
ssl-option?, tls-reqcert-option?, deref-option?,
comma-separated-list-of-strings?, serialize-ignore-users-option, log-option?,
serialize-log-option, valid-map?, scope-option?, serialize-scope-option,
map-entry?, list-of-map-entries?, filter-entry?, list-of-filter-entries?,
serialize-filter-entry, serialize-list-of-filter-entries, serialize-map-entry,
serialize-list-of-map-entries, nslcd-config-file, nslcd-etc-service,
nslcd-shepherd-service, pam-ldap-pam-services, pam-ldap-pam-service,
generate-nslcd-documentation): New procedures.
* gnu/tests/ldap.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (LDAP Services): Document it.
</span></span></td><td>Ricardo Wurmus</td></tr>