How do I change the time format between AM/PM and 24 hours notation?

Bobclass uses the localization settings of your device, meaning whatever time format your devices uses, Bobclass will also use. The same goes for language and currency. To change the time format, go to the iOS settings on your device:

Settings > General > Date & Time > 24-Hour Time

For the client web calendars, you also need to make sure your regional settings are correct:

Settings > General > Language & Region > Region

After you have changed this, you should edit/create an event in the Bobclass app, so that it will push the regional changes to the client web calendar. Then on the web, refresh the page.