Linux命令之日期时间命令date使用实例
date用法1:
格式:date [OPTION]... [+FORMAT]
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, 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
 %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 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)
 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
例如:
1.年月日
$ date +%Y%m%d
20150107
2.年月日,年只保留后两位
~$ date +%y%m%d
150107
3.小时分钟秒
~$ date +%H%M%S
233045
4.年月日时分秒
~$ date +%Y%m%d%H%M%S
20150107233145
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