getting local time over internet (NTP?)

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hello,

i've datalogger (mega2560 , ethernet/sd shield).
i've been able sync arduino time ntp server.

but ntp server gives utc time. , need local time.

is there module/code convert utc local, based on timezone, keep in track summertime ?
to write self nasty (summertime start @ last saturday of march , ends @ last saterday of oktober).

thanks in advance,
jeroen

i using worldtimeengine local time:
http://worldtimeengine.com


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