DATE(1) User Commands DATE(1) NAME date - print or set the system date and time SYNOPSIS(synopsis,概要，大纲) 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. Mandatory arguments to long options are mandatory for short options too.(长选项必须用的参数在使用短选项时也是必须的) -d, --date=STRING display time described by STRING, not 'now' -f, --file=DATEFILE like --date; once for each line of DATEFILE -I[FMT], --iso-8601[=FMT] output date/time in ISO 8601 format. FMT='date' for date only (the default), 'hours', 'minutes', 'seconds', or 'ns' for date and time to the indicated(表明，指示) precision(精度). Example: 2006-08-14T02:34:56-0600 -R, --rfc-2822 output date and time in RFC 2822 format. Example: Mon, 14 Aug 2006 02:34:56 -0600 --rfc-3339=FMT output date/time in RFC 3339 format. FMT='date', 'seconds', or 'ns' for date and time to the indicated precision. Example: 2006-08-14 02:34:56-06:00 -r, --reference=FILE display the last modification time of FILE -s, --set=STRING set time described by STRING -u, --utc, --universal(全世界的，通用的) print or set Coordinated(协调) Universal Time (UTC) --help display this help and exit --version output version information and exit FORMAT controls the output. Interpreted(解释，解读) sequences are: %% a literal(文字的，字面上的) % %a locale's abbreviated(简短的，缩写的) 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(世纪，百年); like %Y, except omit(省略，忽略) 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(填补，填充); 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(纳秒，十亿分之一秒) (000000000..999999999) %p locale's equivalent(相等的，相当于) 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(代表，表示，表示法) (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(数值的) 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(字幕的，按字幕顺序的) time zone abbreviation (e.g., EDT) By default, date pads numeric fields with zeroes. The following optional flags may follow '%': - (hyphen(连字号)) do not pad the field _ (underscore(下划线)) pad with spaces 0 (zero) pad with zeros ^ use upper(上面的) case if possible # use opposite case if possible After any flags comes an optional field width, as a decimal number; then an optional modifier(修饰符), which is either E to use the locale's alternate representations(代表) if available, or O to use the locale's alternate numeric symbols if available. EXAMPLES Convert seconds since the epoch(新世纪，新时代) (1970-01-01 UTC) to a date $ date --date='@2147483647' Show the time on the west coast of the US (use tzselect(1) to find TZ) $ TZ='America/Los_Angeles' date Show the local time for 9AM next Friday on the west coast of the US $ date --date='TZ="America/Los_Angeles" 09:00 next Fri' DATE STRING The --date=STRING is a mostly free format human readable date string such as "Sun, 29 Feb 2004 16:21:42 -0800" or "2004-02-29 16:21:42" or even "next Thursday". A date string may contain items indicating(指明，表明) cal‐ endar(日历) date, time of day, time zone, day of week, relative time, rela‐ tive date, and numbers. An empty string indicates the beginning of the day. The date string format is more complex than is easily docu‐ mented here but is fully described in the info documentation. AUTHOR Written by David MacKenzie. REPORTING BUGS GNU coreutils online help: Report date translation bugs to COPYRIGHT Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later . This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO Full documentation at: or available locally via: info '(coreutils) date invocation' GNU coreutils 8.25 February 2016 DATE(1)