IOS-nsdateformatter format description

The formatting parameters are as follows:

G: The age of the public, such as ad Ad

YY: the last two digits of the year

Yyyy: full year

MM: month, 1-12

Mmm: month, which is abbreviated as the English month, as shown in figure
Jan

Mmmm: month. The full name of the English month is displayed, for example, janualy.

DD: Day, 2 digits, for example, 02

D: Day, 1-2 digits, such as 2

EEE: abbreviated to the day of the week, such as Sun

Eeee: the day of the week, such as Sunday.

AA: Upper afternoon, am/PM

H: hour, in 24-hour format, 0-23

K: hour, in 12-hour format, 0-11

M: minute, 1-2 digits

MM: minute, two digits

S: seconds, 1-2 digits

SS: Second, 2 bits

S: milliseconds

Common date structure:

Yyyy-mm-dd hh: mm: Ss. Sss

Yyyy-mm-dd hh: mm: SS

Yyyy-mm-dd

MM dd yyyy