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

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$ date +%Y%m%d
20150107

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~$ date +%y%m%d
150107

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~$ date +%H%M%S
233045

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~$ date +%Y%m%d%H%M%S
20150107233145