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System hangs when RTC time rollover 1999 to 2000 Error processing of GetTime function: If get time fail,the date/time will display ??, and update help info to let user know get time fail. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Dandan Bi <dandan.bi@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17651 6f19259b-4bc3-4df7-8a09-765794883524