how to get amout of ticks for a reference date on the iphone

I'm programming against a Webservice that requires the amount of ticks (for the current time) (A single tick represents one hundred nanoseconds 开发者_运维百科or one ten-millionth of a second) since 1.1.0001 (midnight).

what is the easiest way to get the amount of ticks from an NSDate Object?

thanks for your help

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Just make 1.1.0001 into an NSDate and then use the NSDate method timeIntervalSinceNow and multiply by 10 million.

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This code will give you GMT time.

const long long UNIX_EPOCH_IN_CLR_TICKS = 621355968000000000 ;
long long time = UNIX_EPOCH_IN_CLR_TICKS + [[NSDate date] timeIntervalSince1970] * pow(10, 7);