After the time change, all password dates have been shifted back an hour. Why?

Document ID : KB000016512
Last Modified Date : 14/02/2018
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Question:

After the time change, all password dates have been shifted back an hour.  Why?

Answer:

  ACF2 uses the hardware clock which is set to Greenwich Mean Time (GMT).    

The GMT is stored in the lidrec as the time portion of the PSWD-TOD.  When   

the lidrec is displayed, the PSWD-TOD time is adjusted by the site's deviance 

from GMT.