Linux Date Usage

In Linux, the time is divided into two types: 1; Use the date command to display the system time, 2 to display hardware time using clock or Hwclock

The system time and hardware time will appear out of sync.

Man Command =manual= command manual

Here's how to use Date:

1 Use the date command to view the current time directly:

[Email protected] ~]#

[[Email protected] ~]# Date

Thu Dec 8 20:36:21 CST 2016

2 Modifying a time with the date command

Date [OPTION] ... [+format]

Date [-u|--utc|--universal] [MMDDHHMM[[CC]YY][.SS]]

Month Day hour minute year. seconds

# date 1208204516.30

3: Format:

Percent a literal%

%a Locale ' s abbreviated weekday name (e.g., Sun) shows the day of the week in abbreviated ways

%A locale ' s full weekday name (e.g., Sunday) displays today's Day of the week with full name

%b Locale ' s abbreviated month name (e.g., Jan) Displays the current month shorthand

%B locale ' s full month name (e.g., January) displays the full name of the current month

%c locale ' s date and time (e.g., Thu Mar 3 23:05:25 2005) show current times

For example:

# date +%c

Thu Dec 09:08:50 PM CST

%c century; Like%Y, except omit the last of the digits (e.g., 20) Show century: as shown 20th century

%d day of month (e.g., 01) shows today the day of the month

%d date; Same as%m/%d/%y display time in month/day/year format

%e Day of month, space padded; Same as%_d show today for the day ordinal of the month

%F full date; Same as%y-%m-%d in month and day format 2016-12-8

%g last digits of the year of the ISO week number (see%G)

%G year of the ISO week number (see%V); Normally useful only with%V

%h Same as%b

%H Hour (00..23)

%I Hour (01..12)

%j Day of the Year (001..366)

%k Hour, Space padded (0..23); Same as%_h

%l Hour, Space padded (1..12); Same as%_i

%m Month (01..12)

%M minute (00..59)

%n a newline

%N nanoseconds (000000000..999999999)

%p locale ' s equivalent of either AM or PM; Blank if not known represents PM

%P like%P, but lower case

%r locale ' s 12-hour clock time (e.g., 11:11:04 PM) 12-hour display times

%R 24-hour hour and minute; Same as%h:%m 24-hour display hours: minutes

%s seconds since 1970-01-01 00:00:00 UTC from January 1, 1970 to today's number of seconds

%s second (00..60) sec

%t a tab

%T time; Same as%h:%m:%s display time in hours: minutes: seconds

%u day of week (1..7); 1 is Monday

%u week number of year, with Sunday as First day of week (00..53)

%V ISO Week number, with Monday as First day of week (01..53)

%w Day of Week (0..6); 0 is Sunday

%W Week number of year, with Monday as First day of week (00..53)

%x locale ' s date representation (e.g., 12/31/99) shows month/day/year

%x locale ' s time representation (e.g., 23:13:48) When displayed: minutes: Seconds

%y last two digits of the year (00..99) shows the final double digits of the years

%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:to necessary precision (e.g.,-04, +05:30)

%Z Alphabetic time zone abbreviation (e.g., EDT)

#date +%d---Display dates in month/day/year format

12/08/16

# Date +%m---Display the current minute

#date +%m---Show month of the month

#date +%y---Display four-digit year (2016)

#date +%y----Show two digits after year (16)

#date + "This is%y"----shown as--this year is 2016

#date +%y-%m-%d by format year-month-day display

#date +%h:%m:%s

#hwclock-W means synchronizing the system time to the hardware

#hwclock-S means synchronizing hardware time to the system

Linux Date Usage