--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/contrib/zeitsort.py	Fri Jun 29 18:38:55 2018 +0200
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# zeitsort
+# --------
+# (c) 2008 by Sascha L. Teichmann <sascha.teichmann@intevation.de>
+#
+# Simple script which sorts lines of zeiterfassung.txt files by date.
+#
+# This is Free Software licensed under the terms of GPLv3 or later.
+# For details see LICENSE coming with the source of 'getan'.
+#
+
+import sys
+import re
+
+from datetime import date
+
+DATE = re.compile("(\d\d)\.(\d\d)\.(\d\d\d\d)")
+
+def date_cmp(a, b):
+    ma = DATE.search(a)
+    mb = DATE.search(b)
+    if not ma and not mb: return cmp(a, b)
+    if ma and not mb: return -1
+    if not ma and mb: return +1
+    da = date(int(ma.group(3)), int(ma.group(2)), int(ma.group(1)))
+    db = date(int(mb.group(3)), int(mb.group(2)), int(mb.group(1)))
+    return cmp(da, db)
+
+def main():
+    all = []
+    while True:
+        line = sys.stdin.readline()
+        if not line: break
+        if not DATE.search(line):
+            # handle multi lines
+            if not all: all.append(line)
+            else:       all[-1] += line
+        else:
+            all.append(line)
+    all.sort(date_cmp)
+    sys.stdout.write(''.join(all))
+    sys.stdout.flush()
+
+if __name__ == '__main__':
+    main()
+
+# vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: