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Andrew Budziszek Output Field Date Format
How do I format the Birthday field on Contact as MM/DD/YYYY?
The format depends on whatever locale your User is set to. That being said, the best way to format this would be creating a new formula field that does it instead. The formula would use the same label, and then you could add it to any page layouts you'd need to. See this post for an example: https://developer.salesforce.com/forums/?id=906F00000008lBKIAY