Date picker transposing day and month numbers, generating JS error

[6554RObert]

Need to be able to use date picker to display the day of week as well as date. I had to add this as a custom:

ddd mm/dd/yy (.ie, Wed 04/22/20)

When I pick a date beyond the 12th of any month, I get a Javascript warning:

Invalid date/time: please make sure that date/time exists.  Field [ Date4_af_date ] should match format ddd mm/dd/yy.

Obviously, when the user clicks on a date in the calendar date picker, it is flipping the day number into the month field.  What am I doing wrong?

[6554RObert · Accepted solution]

Figured out my own workaround.  If I use a custom format that does NOT use a numerical version of the month, this issue goes away.  Takes up a little more space, but it does not generate an error. Went with this format:

ddd, mmm dd, yyyy