Use of Linux date command

date [OPTION]... [+FORMAT]
date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

%% Character%
%a Abbreviation of the day of the week (Sun~Sat)
%A Full name of the day of the week (Sunday~Saturday)
%b Abbreviation of month (Jan~Dec)
%B Full name of the month (January~December)
%c Date and time (Thu 06 Dec 2018 09:43:53 AM CST). Entering only the date command will display the same results.
%C century. Similar to %Y, but does not display the last two digits, such as 20
%d The day of the month (01~31)
%D Date, equivalent to %m/%d/%y, such as 12/06/18
%e The day of the month (1 to 31), single digits are padded with spaces, equivalent to %_d
%F Date, equivalent to %Y-%m-%d, such as 2018-12-06
%g The last two digits of the year (yy). For example, 2018 will output 18, which is equivalent to %y
%G Year (yyyy)
%h Abbreviation of month (Jan~Dec), equivalent to %b
%H Hour, 24-hour system (00~23)
%I Hour, 12-hour format (01~12)
%j The day of the year (001~366)
%k Hour, 24-hour system (0~23). Single digit fills the space, equivalent to %_H
%l Hour, 12-hour format (1 to 12). Single digit fills the space, equivalent to %_I
%m Month (01~12)
%M Minute (00~59)
%n newline
%N nanoseconds (000000000..999999999)
%p displays AM or PM
%P displays am or pm
%r Display time in 12-hour format (hh:mm:ss %p)
%R displays hours and minutes, 24-hour format, equivalent to %H:%M
%s The number of seconds from 00:00:00 on January 1, 1970 to the present. %S Displays seconds (00~59)
%t Tab character %T Displays time in 24-hour format (hh:mm:ss), equivalent to %H:%M:%S
%u Day of the week (1..7). 1 means Monday %U Week number of the year, with Sunday as the first day of the week (00..53)
%V Week number of the year, with Monday as the first day of the week (01..53)
%w The day of the week (0-6), 0 represents Sunday %W The week of the year, Monday is the first day of the week (00..53)
%x Date (mm/dd/yyyy), such as 12/06/2018
%X time, equivalent to %H:%M:%S
%y The last two digits of the year (18 for 2018)
%Y Year (yyyy)
%z displays the time zone in +hhmm format (e.g. +0800)
%:z displays the time zone in +hh:mm format (e.g. +08:00)
%::z displays the time zone in +hh:mm:ss format (e.g. +08:00:00)
%Z abbreviation shows the time zone name, such as CST (China Standard Time)
%h,%b Abbreviation of month (Jan~Dec)
Note on filling characters: By default, the date command fills numeric fields with 0s. The following fill character control characters can be used after %:
- (hyphen): no padding _ (underscore): padding with spaces 0 (zero) padding with 0 ^ Output in uppercase whenever possible # Output in reverse case whenever possible

-d, --date=STRING: Display the time specified by STRING instead of the current timestamp;
-f, --file=DATEFILE: Display the time of each line in the DATEFILE file;
-I[TIMESPEC], --iso-8601[=TIMESPEC]: Display the time in ISO 8601 canonical format with the specified precision [TIMESPEC]. The default value of TIMESPEC is "date", and it can also be 'hours', 'minutes', 'seconds', or 'ns';
-r, --reference=FILE: Display the last modification time of the file -R, --rfc-2822: Display the time in the format specified in RFC-2822, for example: Wed, 05 Dec 2018 22:10:34 +0800
--rfc-3339=TIMESPEC: Display time in the format specified by RFC 3339. The precision can be specified by TIMESPEC. TIMESPEC can take values ​​'date', 'seconds', or 'ns'. For example: 2018-12-05 22:09:59.230994842+08:00
-s, --set=STRING: Set the system time to the time specified by STRING -u, --utc, --universal: Display or set the time format to Coordinated Universal Time (UTC) --help: Display help information for the date command --version: Display version information for the date command

date +%s
1544067345

date -d @1483525407
Wed Jan 4 18:23:27 CST 2017

date -d @1483525407 +"%F %T"
2017-01-04 18:23:27

date +"%Y-%m-%d %H:%M:%S"
2018-12-06 10:57:33

# or date + "%F %T"

date +"%Y-%m-%d %H:%M:%S" //Display the current timedate -d "+1 day" +"%Y-%m-%d %H:%M:%S" //Display the previous daydate -d "-1 day" +"%Y-%m-%d %H:%M:%S" //Display the next daydate -d "-1 month" +"%Y-%m-%d %H:%M:%S" //Display the previous monthdate -d "+1 month" +"%Y-%m-%d %H:%M:%S" //Display the next monthdate -d "-1 year" +"%Y-%m-%d %H:%M:%S" //Display the previous yeardate -d "+1 year" +"%Y-%m-%d %H:%M:%S" //Display the next year

date -d "2009-12-12" +"%Y/%m/%d %H:%M:%S"
2009/12/12 00:00:00

date -s "2016-11-11 00:00:00"
Fri Nov 11 00:00:00 CST 2016

date
Fri Nov 11 00:00:05 CST 2016