diff -r b9a4609d01e4 -r 6f966e1a80bc app/soc/modules/ghop/models/program.py
--- a/app/soc/modules/ghop/models/program.py	Sat Jun 06 20:40:08 2009 +0200
+++ b/app/soc/modules/ghop/models/program.py	Mon Jun 08 08:42:13 2009 +0200
@@ -33,11 +33,21 @@
   """GHOP Program model extends the basic Program model.
   """
 
-  #: Property that contains the latest date of birth before which a Student
-  #: can participate
-  student_min_age = db.DateTimeProperty(required=False)
+  #: Property that contains the minimum age of a student allowed to
+  #: participate
+  student_min_age = db.IntegerProperty(
+      required=True, verbose_name=ugettext('Student minimum age'))
   student_min_age.help_text = ugettext(
-      'Minimum age of the student to sign-up. Given by the latest birthdate allowed')
+      'Minimum age of the student to sign-up in years.')
+
+  #: Property that contains the date as of which above student
+  #: minimum age requirement holds. This is a DateTimeProperty because
+  #: programs might run in a different timezone then the Appengine Server
+  #: is running on.
+  student_min_age_as_of = db.DateTimeProperty(
+      required=True, verbose_name=ugettext('Minimum age as of'))
+  student_min_age_as_of.help_text = ugettext(
+      'Date as of which the student minimum age requirement holds.')
 
   #: Required property containing the number of Tasks Students can work
   #: on simultaneously. For GHOP it is 1