| # Monotonic Time |
| |
| Monotonic time is a measurement of the time since the system was powered on and |
| is maintained by the kernel. Note that the monotonic time may not always reset |
| to zero on reboot and the behavior during sleep/suspend has not yet been |
| defined. |
| |
| Monotonic time is the most reliable time standard on Fuchsia and reading |
| monotonic time is usually cheaper than reading UTC or local time. Monotonic time |
| is always available and it always increases continuously and monotonically. |
| Monotonic time is locked to the frequency of the underlying hardware oscillator |
| and does not attempt to correct for any errors in that oscillator. |
| |
| Since monotonic time counts from power on, it is only meaningful in the context |
| of a single power cycle on a single Fuchsia device. |
| |
| Components may read monotonic time using |
| [`zx_clock_get_monotonic`](/docs/reference/syscalls/clock_get_monotonic.md). |
