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Source: Microsoft Support
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Consider the following scenario: In Windows Vista Media Center, you set up a manual TV recording to occur near or right after daylight saving time ends. After the recording has finished, when you go to view the recording, you find that Media Center did not record the correct television program as expected. Instead, it appears that Media Center recorded a television program that was one hour later than expected.
Note: For most of the United States, daylight saving time (DST) starts at 2:00 A.M on the second Sunday of March. Daylight saving time reverts to standard time (ST) at 2:00 A.M on the first Sunday of November.
If your Windows Vista Media Center PC is set to automatically adjust the clock for DST, it will set the system clock back one hour when DST ends. If you have any manual recordings in Media Center that are set to start an hour before DST ends or right after DST ends, you may find that the recordings are started one hour later than expected.
To work around this issue and ensure that your manually set recordings in Media Center record the expected TV programs during the changeover from DST to ST, you can do one of the following:
1. Disable the option in Windows Vista to automatically adjust for DST. This is a temporary solution to ensure that any manual recordings you have set to occur immediately after DST ends are recorded at the correct and expected time. Once those immediate recordings had finished, you would then want to go back into Windows and enable automatic adjusting for DST. You may also want to make sure than any other preset manual recordings you had configured were still set up for the correct time and programming.
2. If the program you are trying to record is available in the Media Center Electronic Program Guide (EPG), use the EPG to schedule the recording instead of a manual recording. The EPG should correctly reflect programming and account for DST.
Below are some examples of what might occur in the United States to manually scheduled programs in Media Center that occur before, at, or immediately after DST ends.
Recording Start Time: 12:30 AM
Recording Stop Time: 2:00 AM
Result: The manual recording starts and stops at the expected time.
Recording Start Time: 1:00 AM
Recording Stop Time: 1:30 AM
Result: The manual recording starts and stops one hour later than expected. Between the hours of 1:00 A.M. and 2:00 A.M., Windows Vista Media Center (and any other application using .NET Framework) is already converting to standard time. As a result, the manually scheduled TV program starts at 1:00 A.M ST (which would actually be 2:00 A.M. DST).
Recording Start Time: 2:00 AM
Recording Stop Time: 3:00 AM
Result: The manual recording starts and stops one hour later than expected. At 2:00 A.M., Windows Vista resets the system clock back one hour to 1:00 A.M. and reverts to standard time. As a result, the manually scheduled TV program starts at 2:00 A.M. ST (which would actually be 3:00 A.M. DST).
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