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where mm is the optional number of the month (01-12), dd is the optional day of the month, hh is
the hour in 24 hour format (required) mm is the minutes (required), yy is the optional last 2 digits of
the year, and ss is the optional seconds.
date uses these values to set the date and time.
Note:
You must specify the hours and the minutes; other arguments are optional. The year can be
specified only if you have specified the month and day.
The -t option allows you to use the BSD date format, which is:
[[[[cc]yy]mm]dd]hhmm[.ss]
where cc is the optional first 2 digits of the year.
Displaying Date and Time
If the argument to date begins with a + character, date uses format to display the date. date
writes all characters in format, with the exception of the % and the character which immediately
follows it, directly to the standard output. After date exhausts the format string, it outputs a newline
character. The % character introduces a special format field similar to the printf() function in the
C library (see Field Descriptors).
Field Descriptors
%A
%a
%B
%b
%C
%c
%D
the full weekday name in the current locale (for example, Sunday, in the POSIX locale).
the abbreviation for the weekday in the current locale (for example, Sun, in the POSIX
locale).
the full month name in the current locale (for example, February, in the POSIX locale).
the abbreviation for the month name in the current locale (for example, Feb, in the POSIX
locale).
the first two digits of the year (19 or 20).
the appropriate representation of the date and time in the current locale.
the date in the form mm/dd/yy.
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