As the subject says I'm really finding a hard time to solve how this problem of mine. Tried the sync in my mac, manually setting it most of the time doesn't work.
'Settings', 'General', 'Date and Time', 'Set Automatically' -> 'On'.
This works well for a 3G iPad, which gets its time from the cellular service but WiFi-only iPad owners have found that the iPad can be a few minutes out.
Also, make sure the computer you sync with is set correctly. The iPad (Wi-Fi only version) sets it's time to the computer when you sync (so I've been told but never tested).