JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
For that particular date and time field, unfortunately, it is not possible to adjust the time to be 0,1,2,3 instead of 00,01,02,03.
For time you could maybe use Time picker widget, and turn off time section in date and time field:
Please let us know if that could work for you.