Datepicker.js : https://github.com/fengyuanchen/datepicker (js + css)

Clock-Timepicker: https://github.com/loebi-ch/jquery-clock-timepicker (js file only without css)

 

Move to js folder + css folder of child theme, then write to functions.php of child theme:

Set class for input of Clock and Date like class=”clockpicker”, class=”datepicker”, then insert code to

 

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