Index: src/backend/utils/adt/timestamp.c
===================================================================
RCS file: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v
retrieving revision 1.165
diff -c -c -r1.165 timestamp.c
*** src/backend/utils/adt/timestamp.c	13 Jul 2006 16:49:16 -0000	1.165
--- src/backend/utils/adt/timestamp.c	29 Aug 2006 22:04:41 -0000
***************
*** 2518,2523 ****
--- 2518,2530 ----
  
  	/* fractional months full days into days */
  	month_remainder_days = month_remainder * DAYS_PER_MONTH;
+ 	/*
+ 	 *	The remainders suffer from float rounding, so if they are
+ 	 *	within 0.000001 of an integer, we round them to integers.
+ 	 */
+ 	if (month_remainder_days != (int32)month_remainder_days &&
+ 		TSROUND(month_remainder_days) == rint(month_remainder_days))
+ 		month_remainder_days = rint(month_remainder_days);
  	result->day += (int32) month_remainder_days;
  	/* fractional months partial days into time */
  	day_remainder += month_remainder_days - (int32) month_remainder_days;
***************
*** 2571,2576 ****
--- 2578,2590 ----
  
  	/* fractional months full days into days */
  	month_remainder_days = month_remainder * DAYS_PER_MONTH;
+ 	/*
+ 	 *	The remainders suffer from float rounding, so if they are
+ 	 *	within 0.000001 of an integer, we round them to integers.
+ 	 */
+ 	if (month_remainder_days != (int32)month_remainder_days &&
+ 		TSROUND(month_remainder_days) == rint(month_remainder_days))
+ 		month_remainder_days = rint(month_remainder_days);
  	result->day += (int32) month_remainder_days;
  	/* fractional months partial days into time */
  	day_remainder += month_remainder_days - (int32) month_remainder_days;