Microsoft KB Archive/130769

= FIX: Negative Value Passed to mktime Generates Wrong Date =

Article ID: 130769

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft Visual C++ 2.0 Professional Edition
 * Microsoft Visual C++ 2.1

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This article was previously published under Q130769



SYMPTOMS
The wrong date is returned when a negative value is passed for the month to the mktime function.

For example, in the sample code in this article, -1 is passed for the month, so the mktime function should return December 15, 1994. However, it incorrectly returns January 16, 1995.



RESOLUTION
Verify that the value for the month is greater than or equal to zero, when calling the mktime function.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug was corrected in Microsoft Visual C++, 32-bit Edition, version 4.0.



Sample Code to Reproduce Problem
/* Compile options needed: none */

#include   #include 

void main { time_t  CurrentTime, NewTime; struct tm TimeStruct;

time ( &CurrentTime ); TimeStruct = *localtime(&CurrentTime); TimeStruct.tm_mday = 15; TimeStruct.tm_mon = -1; TimeStruct.tm_year = 95;

NewTime = mktime (&TimeStruct); printf("%s", asctime( &TimeStruct)); }

Additional query words: 9.00 9.10

Keywords: kbbug kbfix kblist kbcompiler KB130769

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