For any date field you can define any and as many variations as desired, simply by using "dd" to refer to the day, "mm" for the month, "yy" for short version of the year, and "yyyy" for the full version of the year.
You can also mix and match with your own special characters as some users might for example "wrap" the date variation in parenthesis.
For reverse use the "<" symbol at the end of the variation definition. This will simply generate the values in full reverse order as shown in the example below.
