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You can do that by changing Time Format inside of your Form Builder. Choose field you want to change and inside of your Form Builder select Time Format option and click on AM/PM.
Then your form should look like this.
Let us know if you need further assistance.
I know how to do that but I want to use the 24 hour clock format but be able to put a 0 in front of the single hour digits e.g. I want 3 am to read as 03:00
Unfortunately, it is not possible if you use the "Time" or "DateTime" under the quick tools. However you can try using the manual drop down, DateTime Single Widget or Time Picker Widget.
Here's a demo form of how they looks like.
If you need the manual drop down, you can clone it. Just delete the 2 widgets when you don't need them.
Hope this helps. Let us know if you have any questions.