Starting point for CLOCK_MONOTONIC

Question

As I understand on Linux starting point for CLOCK_MONOTONIC is boot time. In my current work I prefer to use monotonic clock instead of CLOCK_REALTIME

Answer 1

CLOCK_MONOTONIC is generally not affected by any adjustments to system time. For example, if the system clock is adjusted via NTP, CLOCK_MONOTONIC has no way of knowing (nor does it need to).

For this reason, don't use CLOCK_MONOTONIC if you need human-readable timestamps.

See Difference between CLOCK_REALTIME and CLOCK_MONOTONIC? for a discussion.