Mktime error for win 7 and win 2008

Hi I am using WIN 7 machine in which mktime() does not return correct
value when day light savings is on.

I have changed my system time to 30th sept fronm 29th sept after day light saving mktime () is returning m_day value of 29 instead of 30.

I am facing this problem in WINDOWS 7 and Windows 2008 machine in XP it is working fine.

Check the time zone the Win 7 machine is set to. Daylight savings time doesn't change at the same time everywhere in the world.