基本使用格式：
date [-d "time-to-display"] +"format-to-display"-d指定要顯示的時間，如果不指定預設為當前時間；後邊的+後的字串為指定的輸出格式，類式c的print的格式。常用示例如下：
date -d "1 day ago
" +"
%y-%m-%d
"date -d "
30 day ago
" +"
%y-%m-%d
"date -d "
+ 1 day
" +"
%y-%m-%d
"date -d "
- 1 month
" +"
%y-%m-%d
"date -d "
20170427
" +"
%y-%m-%d
"date -d "
20170427
" +"
輸出為：%y-%m-%d
支援的輸出項：
%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)
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