Please, do now use this! In new hack date autofixer is included!
For everyone who has "..title have an invalid date" bug.
You may fix it by two ways:
1) install usbnetwork hack and execute two commands via ssh:
# date MMDDhhmmCCYY.ss
where MM — month, DD — day, hh — hours, mm — minutes, CCYY — 4 digits of year, ss — seconds
For example date 051900592011.30 sets your date into 19 May 2011, 00:59:30 (you can change time later in settings)
After that set system clock to this date:
# hwclock -w
2) by launchpad hack
The same here. Set any keyboard combination to exec command date 051900592011.30 && hwclock -w, update launchpad settings (Shift+Shift+Space) type combinations, be happy. Example