Reformat custom date format

Hi all,

I'm hoping someone can help provide a simple solution to a problem that I created by having a custom date format.

I have 2 columns with dates in a custom format like: yyyy,mm,dd
I don't think the system recognizes this as a valid date format eventhough I formated
the cells the custom format mentioned.

I want to change the format to: mm,dd,yyyy

I would like to do something like the following:

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Any suggestions as to why this is not working?

I've attached a sample.

Thanks,

BDB