String. Default: 'mm/dd/yyyy'
 
 The date format, combination of p, P, h, hh, i, ii, s, ss, d, dd, m, mm, M, MM, yy, yyyy.
 p : meridian in lower case ('am' or 'pm') - according to locale file
 P : meridian in upper case ('AM' or 'PM') - according to locale file
 s : seconds without leading zeros
 ss : seconds, 2 digits with leading zeros
 i : minutes without leading zeros
 ii : minutes, 2 digits with leading zeros
 h : hour without leading zeros - 24-hour format
 hh : hour, 2 digits with leading zeros - 24-hour format
 H : hour without leading zeros - 12-hour format
 HH : hour, 2 digits with leading zeros - 12-hour format
 d : day of the month without leading zeros
 dd : day of the month, 2 digits with leading zeros
 m : numeric representation of month without leading zeros
 mm : numeric representation of the month, 2 digits with leading zeros
 M : short textual representation of a month, three letters
 MM : full textual representation of a month, such as January or March
 yy : two digit representation of a year
 yyyy : full numeric representation of a year, 4 digits