Specifies the display order and formating for the month/day/year wheels. (m - month of year (no leading zero), mm - month of year (two digit), M - month name short, MM - month name long, d - day of month (no leading zero), dd - day of month (two digit), D - day of week (short), DD - day of week (long), y - year (two digit), yy - year (four digit). The options also controls if a specific wheel should appear or not, for example, use 'mmyy' to display month and year wheels only, 'mmD ddy' to display both day of week and date on the day wheel.
Blank – Uses the localised default as defined in the current std_messages file (see 3.10 Localization for details).
Any string using formatting characters described above.