I have 3 custom fields: wpcf-start-date, wpcf-end-date and wpcf-total-days. When a form is submitted I'd like wpcf-total-days to be populated with the number of days from the other two fields.
It needs custom codes, see the solution in details: https://toolset.com/forums/topic/populate-custom-field-with-number-of-days-calculated-from-two-date-fields/#post-1109329
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