There are two kinds of time on Linux, one is hardware time and the other is System time

Date system Time

Clock/hwclock Hardware Clock

Cal Calendar

Date

Print or set the system date or time to display or set the system time in a given format

+%a Show Week

+%a full Display week

+%b Show Month

+%b full Display month

+%c E.g.,thu Mar 3 23:05:25 2005

+%c Show century

+%d Show a few days

+%d 08/16/15

+%e Show a few days =+%d

+%f Show All dates eg%y-%m-%d

+%g Display Year

+%h Show Month

+%h Display hours ( in time format

+%i Display hours ( time -based)

+%j shows the day ordinal of a year

+%k =+%h

+%m Month Arabic numerals

+%m minutes A few

+%n New Line

+%n nanoseconds (000000000..999999999)

+%r e.g., 11:11:04 PM

+%r 24-hour hour and minute; Same as%h:%m

+%s Display 1970 year number of seconds

+%s display number of seconds ( system)

+%t Tab

+%t Time;same as%h:%m:%s+%u

+%u Sunday

+%w the Arabic numerals on a Sunday

+%x Show Date 12/31/99

+%x Show Time 23:13:48

+%y display Year (00..99)

+%y Displays the year. For example,

The following separators are available separated

- -0 ^ #

#date +%y-%m-%d

2015-08-16

Modification Time:

Date [MMDDHHMM[[CC]YY][.SS]]

eg

[[Email protected] ~]# date 0816172515.56

Sun 17:25:56 EDT 2015

Hwclock

tools to access hardware time

-S Synchronous system clock to hardware time

-W synchronous Hardware clock to system clock

Cal Calendar Clendar

Cal [2015]

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There are two kinds of time on Linux, one is hardware time and the other is System time