Detailed explanation of SHELL DATE command
Usage: date [- u] [- d datestr] [- s datestr] [--utc] [--universal] [--date=datestr] [--set=datestr] [--help] [--version] [+ FORMAT] [MMDDhhmm [[CC] YY] [.ss]]
Note: date can be used to display or set the date and time of the system. In terms of display, users can set the format they want to display. The format is set to a plus sign followed by several tags. The list of available tags is as follows:
In terms of time:
%: print out
% n: next line
% t: tabbed
% H: hours (00.23)
% I: hours (01.. 12)
% k: hour (0.23)
% l: hour (1.. 12)
% M: minutes (00.59)
% p: show local AM or PM
% r: direct display time (12-hour format in hh:mm:ss [AP] M)
% s: seconds since 00:00:00 UTC on January 1, 1970% S: seconds (00.61)
% T: direct display time (24-hour system)
% X: equivalent to% H:%M:%S
% Z: show time zone
In terms of date:
% a: what day of the week (Sun..Sat)
% A: what day of the week (Sunday..Saturday)
% b: month (Jan..Dec)
% B: month (January..December)
% c: display date and time directly
% d: day (01.31)
% D: direct display date (mm/dd/yy)
% h: same as% b
% j: day of the year (001. 366)
% m: month (01.. 12)
% U: week ordinal of the year (00.53) (with Sunday as the first day of the week)
% w: day of the week (0.6)
% W: week ordinal of the year (00.53) (with Monday as the first day of the week)
% x: direct display date (mm/dd/yy)
% y: last two digits of the year (00.99)
% Y: full year (000.9999)
If you do not start with a plus sign, you want to set the time, and the format of the time is MMDDhhmm [[CC] YY] [.ss]
Where MM is the month
DD is the day
Hh is hour
Mm is minutes
CC is the first two digits of the year
YY is the last two digits of the year
Ss is number of seconds
Set up a plan:
-d datestr: displays the time set in datestr (non-system time)
-help: displays auxiliary messages
-s datestr: sets the system time to the time set in datestr
-u: displays the current Greenwich mean time
-version: displays the version number
