%a - The abbreviated weekday name according to the current locale.

%A - The full weekday name according to the current locale.

%b - The abbreviated month name according to the current locale.

%B - The full month name according to the current locale.

%c - The preferred date and time representation for the current locale.

%d - The day of the month as a decimal number (range 0 to 31).

%H - The hour as a decimal number using a 24-hour clock (range 00 to 23).

%I - The hour as a decimal number using a 12-hour clock (range 01 to 12).

%j - The day of the year as a decimal number (range 001 to 366).

%m - The month as a decimal number (range 10 to 12).

%M - The minute as a decimal number.

%p - Either 'am' or 'pm' according to the given time value, or the corresponding strings for the current locale.

%S - The second as a decimal number.

%U - The week number of the current year as a decimal number, starting with the first Sunday as the first day of the first week.

%W - The week number of the current year as a decimal number, starting with the first Monday as the first day of the first week.

%w - The day of the week as a decimal, Sunday being 0.

%x - The preferred date representation for the current locale without the time.

%X - The preferred time representation for the current locale without the date.

%y - The year as a decimal number without a century (range 00 to 99).

%Y - The year as a decimal number including the century.

%Z - The time zone or name or abbreviation.

%% - A literal '%' character.