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The usage of Linux date command

1. Command function: date can be used to display and set the date and time of the system.

2. Command parameters:

-d: displays the date and time indicated by the string. Double quotation marks before and after the string: set the date and time according to the string. Double quotation marks around the string-u: display GMT--help: online help-- version: display version information

3. List of date format strings

% n: next line% t: tabbed% H: hours (00-23)% I: hours (01-12)% k: hours (0-23)% l: hours (1-12)% M: minutes (00-59)% p: display local AM or PM%r: direct display time (12-hour system) Format: hh:mm:ss [AP] M)% s: number of seconds since 00:00:00 UTC on January 1, 1970% S: seconds (00-60)% T: direct display time (24-hour system)% X: equivalent to% H:%M:%S%Z: display time zone% a: day of the week (Sun-Sat)% A: day of the week (Sunday-Saturday)% b: month (Jan-Dec)% B: month (January-December)% c: direct display date and time% d: day (01-31)% D: direct display date (mm/dd/yy)% h: same% b% j: day of year (001-366)% m: month (01-12)% U: week of year (00-53) (with Sunday as The first day of the week)% w: day of the week (0-6)% W: week of the year (00-53) (in the case of 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 (0000-9999)

4. Examples

Displays the current time in the format: 2019-09-18 10:20:30 [root@localhost ~] # date "+% F% T"

What day was it the day before yesterday?

[root@localhost ~] # date +% A-- date'- 2day'

Set the current time to: 2019-09-18 10:20:30

[root@localhost] # date-s "2019-09-18 10:20:30"

Output yesterday date

[root@localhost ~] # date-d "- 1day"+% F% T"

Output after 2s

[root@localhost ~] # date-d "2second"+% F% T"

Show the date of the following day

[root@localhost ~] # date-d "1day"+% F% T"

Show the date of last month

[root@localhost ~] # date-d "- 1month"+% F% T"

Show the date of last year

[root@localhost ~] # date-d "- 1year"+% F% T"

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