time.h in arduino

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hi all,
i want calculate time interval.
if consider communication betweenco mputer , board, it's normal takes time. doing simply
measuring time in c code , print result back, not measuring time on pc.
so included time.h
but arduino0018 not include time.h
does know , how can use c time.h in arduino.
thanks in advance.
--arpan

are looking 1 in arduino-0018/libraries/time?


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