Last Saved Time/Date Summary property
The Last Saved Time/Date Summary property conveys the last time when this installation package, transform, or patch package was modified.
Initially, an author should set the value of the Last Saved Time/Date Summary property to Null to indicate that no changes have yet been made to the package. An author should then update the Last Saved Time/Date Summary property to the current system time/date each time a modified installation database, transform, or patch package is saved.
Windows Installer 5.0 on Windows Server 2012, Windows 8, Windows Server 2008 R2 or Windows 7. Windows Installer 4.0 or Windows Installer 4.5 on Windows Server 2008 or Windows Vista. Windows Installer on Windows Server 2003 or Windows XP