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diff --git a/src/language/expressions/ChangeLog b/src/language/expressions/ChangeLog
index cd1ef123..a5895b66 100644
--- a/src/language/expressions/ChangeLog
+++ b/src/language/expressions/ChangeLog
@@ -1,3 +1,61 @@
+2007-07-17  Ben Pfaff  <blp@gnu.org>
+
+	Patch #19335.  Reviewed by John Darrington.
+
+	* evaluate.h.pl: Use strict and all warnings.  Fix warnings that
+	this triggers.
+
+	* evaluate.inc.pl: Ditto.
+
+	* generate.pl: Ditto.
+
+	* operations.h.pl: Ditto.
+
+	* optimize.inc.pl: Ditto.
+
+	* parse.inc.pl: Ditto.
+
+2007-04-15  Ben Pfaff  <blp@gnu.org>
+
+	* parse.c (expr_get_function): New function.
+	(expr_get_function_cnt): New function.
+	(expr_operation_get_name): New function.
+	(expr_operation_get_prototype): New function.
+	(expr_operation_get_arg_cnt): New function.
+
+Thu Feb  1 06:59:27 2007  Ben Pfaff  <blp@gnu.org>
+
+	* parse.c (parse_function): Accept TO in any case for use with
+	n-ary functions.  Fixes bug #18923.  Thanks to John Darrington for
+	reporting this bug.
+
+Sat Dec 16 12:20:14 2006  Ben Pfaff  <blp@gnu.org>
+
+	* operations.def: Reverse order of arguments to DATEDIFF, for
+	compatibility.  Thanks to Daniel Williams
+	<Daniel.E.Williams@state.or.us> for reporting this bug.
+
+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,