About date in linux Command Learning

In linux, the date command is used to display and set the system date and time. On a linux server, you can use man date to view the usage of date. In the date setting time format command, each option has the following meanings:-d datestr, -- date datestr: displays the date-s datestr described by datestr, -- set datestr sets the date 1 described by datestr, and % n: Next row % t: Hop grid % H: hour (00 .. 23) % I: hour (01 .. 12) % k: hour (0 .. 23) % l: hour (1 .. 12) % M: minute (00 .. 59) % p: Local AM or PM % r: direct display time (in 12-hour format: hh: mm: ss [AP] M) % s: seconds from January 1, 1970 00:00:00 UTC till now % S: seconds (00 .. 61) % T: direct display time (in 24-hour format) % X: equivalent to % H: % M: % S % Z: Display Time Zone % A: The day of the week (Sun .. sat) % A: The day of the week (Sunday .. saturday) % B: Month (Jan .. dec) % B: Month (January .. december) % c: Display date and time % d: Day (01 .. 31) % D: Display date (mm/dd/yy) % h: Same as % B % j: day of the year (001 .. 366) % m: Month (01 .. 12) % U: Week (00 .. 53) (Sunday is the first day of a week) % w: The day of a week (0 .. 6) % W: Week (00 .. 53) (Monday is the first day of a week) % x: displays the date (mm/dd/yy) % y: the last two digits of the Year (00.99) % Y: full Year (0000 .. 9999) 2. date-s // set the current time in terms of the set time. Only the root permission can be set. Settings, others can only be viewed. Date-s 20080523 // set to 20080523, so that the specific time is set to null 00: 00: 00 date-s 01:01:01 // set the specific time, do not change the date-s "01:01:01" // you can set the full time date-s "01:01:01 20080523" // you can set the full time date-s "01:01:01 ″ // you can set the full time date-s "20080523 01:01:01" // you can set the full time 3. date calculation date + % Y % m % d // display the date of the day before yesterday + % Y % m % d -- date = "+ 1 day" // display the date of the previous day + % Y % m % d -- date = "-1 day" // display date + % Y % m % d -- date = "-1 month" // display date + % Y % m % d -- date = "+ 1 month "// display the date of the next month + % Y % m % d -- date ="-1 year "// display the date of the previous year + % Y % m % d -- date = "+ 1 year" // display the date of the next year. 4. Example: in a linux environment, to obtain the period a few days ago, you only need to use date-d "x days ago" + % Y % m % dx instead of a number. If you need to directly write a positive number a few days ago, if you want to directly write a negative number to the date after a few days, replace date-d "x weeks ago" + % Y % m % dx with a number. If you need to write a positive number directly a few weeks ago, if you want to write a negative number for the date after a few weeks, replace date-d "x years ago" + % Y % m % dx with a number. If you want to write a positive number directly a few years ago, if it takes a few years, write a negative number directly on the date;