# Clocks

There are several clock displays in the user interface for Ardour:

- Primary transport clock

- Secondary transport clock

- Nudge clock

- Region position and length clocks

- SMPTE offset clock

and more. All of these clocks provide the same operations and can be used in the same way.

## Clock Operations

### Changing Clock Mode

All clocks can be used in any one of 5 modes:

- SMPTE time

- BBT time

- Audio frames

- Minutes:Seconds

- Off

To change clock modes, simply ContextClick on the clock, and select the desired mode from the popup menu.

### Editing Clock Values