CLOCK_MONOTONIC is affected by NTP on Linux, at least. UNIX time is not actually seconds since the epoch. It's just something very, very close. There are a f

CLOCK_MONOTONIC is affected by NTP on Linux, at least. UNIX time is not actually seconds since the epoch. It's just something very, very close. There are a few cases where the same time_t value repeats for two seconds in order to insert a leap second. With regard to Windows, I assume there are equivalents to all these interfaces, but I don't know what they are.