Concatenate 3 fields into a 4th hidden field?

  • I have 3 fields in my Front End Admin form:
    Day (dropdown 01, 02, 03…)
    Month (dropdown 01, 02, 03…)
    Year (hidden field) I need “Always = current year”)

    I want a 4th field: can be in either
    – Front End Admin (as hidden field) or
    – WP Users Meta

    Which concatenates the 3 fields into the standard datepicker format DD/MM/YYYY or MM/DD/YYYY

    I want to do this without custom code… can it be done using the fields in here with some clever commands?

    Trying for a no-code solution…
    Thanks

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