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diff --git a/src/language/expressions/ChangeLog b/src/language/expressions/ChangeLog
index cd1ef123..a55b977f 100644
--- a/src/language/expressions/ChangeLog
+++ b/src/language/expressions/ChangeLog
@@ -1,3 +1,26 @@
+Wed Dec 13 19:33:52 2006  Ben Pfaff  <blp@gnu.org>
+
+Wed Dec 13 19:30:26 2006  Ben Pfaff  <blp@gnu.org>
+
+	Implement support for DATESUM, DATEDIFF expression functions.  See
+	patch #5637.
+	
+	* helpers.c (enum date_unit): New enum.
+	[!HAVE_TRUNC] (trunc): New function.
+	(recognize_unit): New function.
+	(year_diff): New function.
+	(month_diff): New function.
+	(quarter_diff): New function.
+	(date_unit_duration): New function.
+	(expr_date_difference): New function.
+	(enum date_sum_method): New function.
+	(recognize_method): New function.
+	(add_months): New function.
+	(expr_date_sum): New function.
+	
+	* operations.def: Implement DATESUM, DATEDIFF functions.  Mark
+	VALUELABEL no_abbrev.
+
 Sun Dec 10 16:49:33 2006  Ben Pfaff  <blp@gnu.org>
 
 	* operations.def: Implement VALUELABEL function.  Add DATEDIFF,