How to change clock from 12 Hours to 24 hours and remove AM PM clock?

Yes, you can change clock settings for your customer. It is supported in all plans. By default, it is set to 12 hour clock. After activating above setting, it will convert into 24 hour clock. Please checkout the following images to see the difference.
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Please follow below steps to activate above setting:

1. Click on General Settings Tab then Store Calendar Widget

2. Under Calendar Widget Settings, Check ‘24 hr Time Format’ checkbox

3. Click Save.

4. Check in your store to see the new changes.

12hrs clock

24hrs clock