"d" The one- or two-digit day.
"dd" The two-digit day. Single-digit day values are preceded by a zero.
"ddd" The three-character weekday abbreviation.
"dddd" The full weekday name.
"h" The one- or two-digit hour in 12-hour format.
"hh" The two-digit hour in 12-hour format. Single-digit values are preceded by a zero.
"H" The one- or two-digit hour in 24-hour format.
"HH" The two-digit hour in 24-hour format. Single-digit values are preceded by a zero.
"m" The one- or two-digit minute.
"mm" The two-digit minute. Single-digit values are preceded by a zero.
"M" The one- or two-digit month number.
"MM" The two-digit month number. Single-digit values are preceded by a zero.
"MMM" The three-character month abbreviation.
"MMMM" The full month name.
"t" The one-letter AM/PM abbreviation (that is, AM is displayed as "A").
"tt" The two-letter AM/PM abbreviation (that is, AM is displayed as "AM").
"yy" The last two digits of the year (that is, 1996 would be displayed as "96").
"yyyy" The full year (that is, 1996 would be displayed as "1996").