Daytime saving

My XP wont stay on daylight saving time,it is set on the right time zone it is ticked in daylight box, tried updating time to windows time thingo, if I change the time it just reverts to standard time on reboot
 
I have not changed the battery but I just found out it reverts and still keeps time but not daylight saving time without being shutdown,so I doubt it is the battery
 
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