linux date命令的输出格式

DATE(1)                          User Commands                         DATE(1)

NAME
       date - print or set the system date and time

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

DESCRIPTION
       Display the current time in the given FORMAT, or set the system date.

       -d, --date=STRING

              display time described by STRING, not `now'

     

       -f, --file=DATEFILE
              like --date once for each line of DATEFILE

       -r, --reference=FILE

              display the last modification time of FILE 

    CST   代表China Standard Time

   qustdjx@qustdjx-K42JZ:~/test$ date -r test.c  
   2012年 08月 01日 星期三 19:14:26 CST

       -R, --rfc-2822
              output  date  and time in RFC 2822 format.  Example: Mon, 07 Aug

              2006 12:34:56 -0600

     qustdjx@qustdjx-K42JZ:~/test$ date -R
     Wed, 01 Aug 2012 20:43:41 +0800

       --rfc-3339=TIMESPEC
              output date and time in RFC 3339 format.  TIMESPEC=`date', `sec‐
              onds',  or  `ns'  for  date and time to the indicated precision.
              Date and time  components  are  separated  by  a  single  space:
              2006-08-07 12:34:56-06:00

       -s, --set=STRING

              set time described by STRING

   

    如将系统时间设定成2012年08月1日的命令如下。

    #date -s 08/01/12
    将系统时间设定成下午20点50分9秒的命令如下。
    #date -s 20:50:09

  

    设置完系统时间后,还需要同步到硬件时钟上
    # clock --systohc

    硬件时钟与系统时钟同步：

    # hwclock --hctosys
    或者
    # clock --hctosys

    上面命令中，--hctosys表示Hardware Clock to SYStem clock。

    系统时钟和硬件时钟同步：

    # hwclock --systohc
    或者
   # clock --systohc

          -u, --utc, --universal

              print or set Coordinated Universal Time

        qustdjx@qustdjx-K42JZ:~/test$ date -u
        2012年 08月 01日 星期三 12:42:45 UTC

       --help display this help and exit

输出格式：

FORMAT controls the output.  Interpreted sequences are:
       %%     a literal %

       %a     locale's abbreviated weekday name (e.g., Sun)

       %A     locale's full weekday name (e.g., Sunday)

       %b     locale's abbreviated month name (e.g., Jan)

       %B     locale's full month name (e.g., January)

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

       %C     century; like %Y, except omit last two digits (e.g., 20)

       %d     day of month (e.g, 01)

       %D     date; same as %m/%d/%y

       %e     day of month, space padded; same as %_d

       %F     full date; same as %Y-%m-%d

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

       %G     year of 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 year (001..366)

       %k     hour ( 0..23)

       %l     hour ( 1..12)

       %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

       %P     like %p, but lower case

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

       %R     24-hour hour and minute; same as %H:%M

       %s     seconds since 1970-01-01 00:00:00 UTC

       %S     second (00..60)

       %t     a tab

       %T     time; same as %H:%M:%S

       %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)

       %X     locale's time representation (e.g., 23:13:48)

        %y     last two digits of year (00..99)

       %Y     year

       %z     +hhmm numeric timezone (e.g., -0400)

       %:z    +hh:mm numeric timezone (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)