Mandy's solution is a workaround. @IRon6 I'm curious about what dependency is looking for a different date format? I'd be tempted to tackle the problem from there..
Are you wanting to format a property that was in the date picker field?
If you are using a date that was placed in Hubspot using the date picker field then you cannot alter the date inside of Hubspot (without operations hub) or using Zapier and place it in the same date picker field. You have to put the formatted information into a new field that is a single line text field