[ntp:questions] POSIX Timestamp to NTP Timestamp
mattdavis9 at gmail.com
Tue Sep 28 12:40:46 UTC 2010
I am having some trouble converting a POSIX UTC timestamp into a NTP timestamp.
The former being from the epoch starting January 1, 1970 at 12AM and the latter
being that of January 1 1900 12AM.
In summary my equation is this:
/* Seconds between 1970 and 1900 (with 17 leap years) */
uint64_t epoch_difference = (365 + 17) * 24 * 60 * 60;
uint64_t ntp_timestamp = (time(NULL) - epoch_difference) << 32;
Unfortunately, when I interpret this value, I keep getting values in 2036. I
know my version of time() is from the 1970 epoch. So I am a tad confused here.
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