Y : year with 4 digits.
y : year with 2 digits.
M : month with 3 charachter of name.
m : month with 2 digits.
n : month with 1 digits.
d : day with 2 digits.
j : day with 1 digits.
l : day with day name compelete.
D : day with day name with 3 character.
H : hour 2 digit with 24 hours. G : hour 1 digit with 24 hours.
h : hour 2 digit with 12 hours. g : hour 1 digit with 12 hours.
i : min 2 digit . we do not have 1 digit for minutes
s : second 2 digit we do not have 1 digit for second