You can quickly change the time format between 12 hour and 24 hour by double-clicking the clock at the center of your dashboard. 

When switching to the 12 hour display the AM/PM unit will display for a moment and then fade away to keep the interface clean.

Changing the time unit on your dashboard

To change the clock format between 12 and 24 hour, double-click the clock at the center of your dashboard.

Changing the time format in your settings

You can also change the clock format in your General settings.

1. Click on the Settings icon at the bottom left corner of your screen.
2. Scroll down your General settings until you see Clock Format.
3. Click on the 12 hour or 24 hour option.