Summary of Linux date command knowledge points

Usage: date [options]... [+format] or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]

Displays the current time in the given format, or sets the system date.

-d, --date=string Display the time described by the specified string instead of the current time
-f, --file=date file is similar to --date, read the time description line by line from the date file
-r, --reference=file Display the last modification time of the specified file
-R, --rfc-2822 Output date and time in RFC 2822 format Example: Monday, August 7, 2006 12:34:56 -0600
--rfc-3339=TIMESPEC Output date and time in RFC 3339 format.
TIMESPEC=`date',`seconds',or`ns'
Indicates the display precision of date and time.
Date and time units are separated by a single space:
2006-08-07 12:34:56-06:00
-s, --set=string Set the specified string to separate the time
-u, --utc, --universal Output or set Coordinated Universal Time
--help Display this help message and exit
--version show version information and exit

The given format FORMAT controls the output, interpreting the sequence as follows:

%% A literal %
%a The abbreviation of the day of the week in the current locale (e.g. day for Sunday)
%A The full name of the day of the week in the current locale (e.g. Sunday)
%b The abbreviation of the month name in the current locale (e.g., 一, for January)
%B The full name of the month in the current locale (e.g. January)
%c The current locale date and time (e.g. Thursday, March 3, 2005 23:05:25)
%C Century; like %Y, usually omitting the last two digits of the current year (for example: 20)
%d The day of the month (for example: 01)
%D Day of the month; equal to %m/%d/%y
%e The day of the month, add a space, equal to %_d
%F Full date format, equivalent to %Y-%m-%d
%g Last two digits of the year in ISO-8601 format (see %G)
%G ISO-8601 format year (see %V), usually only used in conjunction with %V
%h is equal to %b
%H Hours (00-23)
%I Hour (00-12)
%j Date in year (001-366)
%k hour (0-23)
%l hours (1-12)
%m Month (01-12)
%M points (00-59)
%n Line break
%N Nanoseconds (000000000-999999999)
%p "AM" or "PM" in the current locale. Output is empty if unknown.
%P is similar to %p, but outputs lowercase letters
%r The 12-hour clock time in the current locale (e.g. 11:11:04 PM)
%R 24-hour time, hours and minutes, equivalent to %H:%M
%s The number of seconds that have passed since 1970-01-01 00:00:00 UTC
%S Seconds (00-60)
%t Output tab character
%T time, equal to %H:%M:%S
%u Week, 1 represents Monday
%U Week number of the year, with Sunday as the first day of the week (00-53)
%V The week number of the year in ISO-8601 format, with Monday as the first day of the week (01-53)
%w The day of the week (0-6), 0 represents Monday
%W Week number of the year, with Monday as the first day of the week (00-53)
%x Date description in the current locale (e.g. 12/31/99)
%X Time description in the current locale (e.g. 23:13:48)
%y The last two digits of the year (00-99)
%Y Year
%z +hhmm numeric time zone (e.g., -0400)
%:z +hh:mm numeric time zone (e.g., -04:00)
%::z +hh:mm:ss numeric time zone (e.g., -04:00:00)
%:::z Numeric time zone with necessary precision (e.g., -04, +05:30)
%Z Alphabetical time zone abbreviation (e.g., EDT)

By default, numeric fields for dates are filled with zeros.

The following optional tokens may follow the "%":

- (hyphen) does not fill this field
_ (underscore) is filled with spaces
0 (number 0) fill with 0
^ Use uppercase letters when possible
# Use reverse case when possible

An optional field width specification is also allowed after any markers, which is a decimal number.

As an optional modifier, it can be E, using the locale-specific

representation; or O, using the locale's associated numeric symbol when possible.

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