I thought this Daylight Savings issue was fixed in last year’s patch. Guess not. Here are the links for the CAB file download as well as the desktop (setup.msi) installer version.
Update for Windows Mobile for PC (KB949168) (SETUP.MSI)
Update for Windows Mobile for PC (KB949168) (WMDST2008-1.CAB)
FYI: I just installed the CAB file installer version on my Dash. It restarted my smartphone without even giving a warning that it was about to do so.