How to set a specific date (fixed value) as default value on a date field? I have a commerce order on which I have added a date field. The options for the default value are Now or Relative. How can I add a fixed default value, f.x. 20 Aug 2016?
Since, it isn't clarify about if the datefield is asking you for a PHP code or not; you can just use this:

2016-08-20


In that way the field will change that date into what you want.