Bug #8068 TIMEDIFF with first negative argument gives wrong result

Submitted: 21 Jan 2005 13:20 Modified: 20 Apr 2005 1:41
Reporter: Dmitry Lenev Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Server Severity:S3 (Non-critical)
Version:4.1.9 OS:Any (Any)
Assigned to: Dmitry Lenev CPU Architecture:Any

[21 Jan 2005 13:20] Dmitry Lenev 
Description:
TIMEDIFF() function gives wrong result if its first argument is negative time value and its second is positive time value.

How to repeat:
mysql> select timediff('01:00:00', '02:00:00');
+---------------------------------+
| timediff('01:00:00','02:00:00') |
+---------------------------------+
| -01:00:00                       |
+---------------------------------+
1 row in set (0.00 sec)

# RIGHT: 1 - 2 = -1

mysql> select timediff('-01:00:00', '02:00:00');
+----------------------------------+
| timediff('-01:00:00','02:00:00') |
+----------------------------------+
| 03:00:00                         |
+----------------------------------+
1 row in set (0.00 sec)

# WRONG: -1 - 2 = -3 !

mysql> select timediff('01:00:00', '-02:00:00');
+----------------------------------+
| timediff('01:00:00','-02:00:00') |
+----------------------------------+
| 03:00:00                         |
+----------------------------------+
1 row in set (0.00 sec)

# RIGHT: 1 - (-2) = 3

mysql> select timediff('-01:00:00', '-02:00:00');
+-----------------------------------+
| timediff('-01:00:00','-02:00:00') |
+-----------------------------------+
| 01:00:00                          |
+-----------------------------------+
1 row in set (0.00 sec)

# RIGHT: -1 - (-2) = 1
[28 Mar 2005 12:19] Bugs System 
A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/23413
[18 Apr 2005 11:57] Bugs System 
A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/24108
[18 Apr 2005 18:26] Dmitry Lenev 
Fixed in 4.1.12 and 5.0.5
[20 Apr 2005 1:41] Paul DuBois 
Noted in 4.1.12, 5.0.5 changelogs.

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