Often we need to convert the system time to local time of the plant and if the local time of the plant observes day light then result is 1 hour off sometimes. This problem occurs due to time difference of daylight saving. If you are facing this problem (like me) then please check your DST system using transaction STZBC.

Fig1 - First check whether Daylight rule is active or not.


Fig2 Check the rule (Variable summer time rule)

Fig3 Check the rule (Fixed summer time rule)

Let us know if this was helpful.