Linux date命令

date - print or set the system date and time打印或者设置系统日期和时间

命令格式：date [OPTION] ... [+FORMAT]

常用参数及说明：更多参数可以参考man date页面

-d：--date=STRING STRING通常情况下是我们可读的时间字符串。比如，now、yesterday、next Monday

-s：--set=STRING 设置时间

FORMAT：

%c：显示日期和时间(e.g., Thu Mar  3 23:05:25 2005)

%C：显示日期和时间(格式：%m/%d/%y)

%F：显示日期和时间(格式：%Y-%m-%d)

%H：小时(00..23)

%I：小时(01..12)

更多格式信息(来自man date页面)

       %%     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)
       By default, date  pads  numeric  fields  with  zeroes.   The  following
       optional flags may follow ‘%’:
       -      (hyphen) do not pad the field
       _      (underscore) pad with spaces
       0      (zero) pad with zeros
       ^      use upper case if possible
       #      use opposite case if possible
       After  any  flags  comes  an optional field width, as a decimal number;
       then an optional modifier, which is either E to use the locale’s alter-
       nate  representations  if available, or O to use the locale’s alternate
       numeric symbols if available.