You can set the hour format to 12 hour or 24 hour for the whole workspace. This setting will apply to the times displayed in meeting link page and emails for every user.
Here are the steps you need to take to change the hour format
Click on Admin Panel.
Click on card Hour format.
Choose your desired hour format from the dropdown.
Click on Save changes.
Take the example of night 9 PM. This will be displayed like this for the two formats:
AM/PM - 9:00 PM
24 hour - 21:00