Always provide the same date and time in 'Py_GetBuildInfo'.
This is the information shown at the REPL and in 'sys.version'.
We cannot pass it in CPPFLAGS due to whitespace in the DATE string.

--- a/Modules/getbuildinfo.c
+++ b/Modules/getbuildinfo.c
@@ -4,6 +4,10 @@
 #include <stdio.h>
 #endif
 
+/* Deterministic date and time.  */
+#define DATE "Jan  1 1970"
+#define TIME "00:00:01"
+
 #ifndef DATE
 #ifdef __DATE__
 #define DATE __DATE__
td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'/><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=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>refs</a><a class='active' href='/guix/log/tests/ui.scm'>log</a><a href='/guix/tree/tests/ui.scm?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>tree</a><a href='/guix/commit/tests/ui.scm?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>commit</a><a href='/guix/diff/tests/ui.scm?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/ui.scm'>
<input type='hidden' name='id' value='6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'/><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=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>root</a>/<a href='/guix/log/tests?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>tests</a>/<a href='/guix/log/tests/ui.scm?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe'>ui.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/tests/ui.scm?id=6b83d6060b2fc2ec78a485ae6d75432e31bb00fe&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-12-13 17:46:39 +0100'>2022-12-13</span></td><td><a href='/guix/commit/tests/ui.scm?id=bbcd06e56c06376e640a7ac81a7109e7135a20f2'>ui: Take package upstream name into account when searching.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/ui.scm (%package-metrics): Add PACKAGE-UPSTREAM-NAME*.
* tests/ui.scm ("package-relevance and upstream name"): New test.

Co-authored-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Lars-Dominik Braun</td></tr>