---
title: kIOTimerClockMachAbsoluteTime
framework: driverkit
role: symbol
role_heading: Enumeration Case
path: driverkit/kiotimerclockmachabsolutetime
---

# kIOTimerClockMachAbsoluteTime

A clock type representing the numer of ticks since the last reboot.

## Declaration

```occ
kIOTimerClockMachAbsoluteTime
```

## Discussion

Discussion This constant is a clock type whose value is from mach_absolute_time() in tick units. This clock type does not advance when the computer is asleep.

## See Also

### Timer Options

- [kIOTimerClockUptimeRaw](driverkit/kiotimerclockuptimeraw.md)
- [kIOTimerClockMonotonicRaw](driverkit/kiotimerclockmonotonicraw.md)
- [kIOTimerClockRealTime](driverkit/kiotimerclockrealtime.md)
- [kIOTimerClockWallTime](driverkit/kiotimerclockwalltime.md)
- [kIOTimerClockMachContinuousTime](driverkit/kiotimerclockmachcontinuoustime.md)