diff --git a/share/roundup/templates/devel/extensions/timezone.py b/share/roundup/templates/devel/extensions/timezone.py
--- /dev/null
@@ -0,0 +1,37 @@
+# Utility for replacing the simple input field for the timezone with
+# a select-field that lists the available values.
+
+import cgi
+
+try:
+ import pytz
+except ImportError:
+ pytz = None
+
+
+def tzfield(prop, name, default):
+ if pytz:
+ value = prop.plain()
+ if '' == value:
+ value = default
+ else:
+ try:
+ value = "Etc/GMT%+d" % int(value)
+ except ValueError:
+ pass
+
+ l = ['<select name="%s"' % name]
+ for zone in pytz.all_timezones:
+ s = ' '
+ if zone == value:
+ s = 'selected=selected '
+ z = cgi.escape(zone)
+ l.append('<option %svalue="%s">%s</option>' % (s, z, z))
+ l.append('</select>')
+ return '\n'.join(l)
+
+ else:
+ return prop.field()
+
+def init(instance):
+ instance.registerUtil('tzfield', tzfield)