Autofill date in another field but with different format

[Guest]

I have a form with dates that have different formats. I wanna be able to autofill all the dates but the problem is that the 1st field where in users will input the date has the typical mm/dd/yyyy format while the other has a Combo format of yyyymmdd. Is there a script that will allow the 2nd field to autofill in its required format?

[Joel Geraci]

Set the format of the 2nd field to date (Custom) and add the pattern "yyymmdd" in the box that show up. Then in the calculate action, add a custom JavaScript as follows. Change the field name to match your 1st field.

event.value = this.getField("firstDateField").value

[Guest]

Tried this and an error pops up. "Invalid date/time: please ensure that the date/time exists. Field [date2] should match format yyyymdd"