I was redirected to a sample application for DateTime Picker (https://creator.zoho.com/sampleapps/time-format/form-perma/Date_Time_Picker/) in this URL (https://help.zoho.com/portal/en/community/topic/masked-edit-textbox-in-contact-form)

I think the sample application is not working. It is throwing an error message "Error occured please contact application owner." as illustated in the attachment.
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Deepak Vasudevan
http://thamizhththendral.blogspot.com/