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To add a pre-filled date and time field to your form, simply add a datetime field as seen below.
Then on the Properties option, select Default Date and set it to Current. Or if you want to pre-fill to a custom date, simply select the Custom field.
Then turn on the Time option and set Current as the default time.
You should now have a DateTime field that is automatically pre-filled with the current date and time.
You can check out this demo to see it in action: https://form.jotform.com/60867900973971
Do let us know if you need further assistance.