diff --git a/ChangeLog b/ChangeLog
index f9a406346..531950c34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2004-11-09  Don Allingham  <dallingham@users.sourceforge.net>
+	* src/DateParser.py: Handle month=12 in gregorian_valid
+
 2004-11-09 Alex Roitman  <shura@alex.neuro.umn.edu>
 	* src/WriteGedcom.py: Remove extraneous import.
 
diff --git a/src/DateParser.py b/src/DateParser.py
index 20c22883e..0216277a6 100644
--- a/src/DateParser.py
+++ b/src/DateParser.py
@@ -49,18 +49,21 @@ import Date
 # Top-level module functions
 #
 #-------------------------------------------------------------------------
+_max_days = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ]
+
 def gregorian_valid(date_tuple):
     day = date_tuple[0]
     month = date_tuple[1]
     valid = True
-    if month > 12:
-        valid = False
-    elif day > _max_days[month]:
+    try:
+        if month > 12:
+            valid = False
+        elif day > _max_days[month-1]:
+            valid = False
+    except:
         valid = False
     return valid
 
-_max_days = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ]
-
 #-------------------------------------------------------------------------
 #
 # Parser class