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Level 7

You can do a script like the following which will clear the entry if they don't follow the correct pattern:

(if formcalc in the exit event for the calendar)

var startDate = $.formattedValue

if (Date2Num(startDate, "DD/MMMM/YYYY") == 0) then

$=""

endif

the Date2Num will give 0 if the pattern isn't correct.