JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can automatically set default values on your date field by following this screenshot:
Same goes with the "Time" field or if you enable the "Time" option in a date field.
If I misunderstood your concern, please do provide us more information on what you would like to accomplish.
We'll wait for your response.