or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
Display the current time in the given FORMAT, or set the system date.
Mandatory arguments to long options are mandatory for short options too.
-d, --date=STRING display time described by STRING, not 'now'
-f, --file=DATEFILE like --date once for each line of DATEFILE
-I[TIMESPEC], --iso-8601[=TIMESPEC] output date/time in ISO 8601 format.
TIMESPEC='date' for date only (the default),
'hours', 'minutes', 'seconds', or 'ns' for date
and time to the indicated precision.
-r, --reference=FILE display the last modification time of FILE
-R, --rfc-2822 output date and time in RFC 2822 format.
Example: Mon, 07 Aug 2006 12:34:56 -0600
--rfc-3339=TIMESPEC output date and time in RFC 3339 format.
TIMESPEC='date', 'seconds', or 'ns' for
date and time to the indicated precision.
Date and time components are separated by
a single space: 2006-08-07 12:34:56-06:00
-s, --set=STRING set time described by STRING
-u, --utc, --universal print or set Coordinated Universal Time (UTC)
--help display this help and exit
--version output version information and exit
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
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 alternate representations if available, or
O to use the locale's alternate numeric symbols if available.
Examples:
Convert seconds since the epoch (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'
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report date translation bugs to <http://translationproject.org/team/>
For complete documentation, run: info coreutils 'date invocation'
[purpleendurer @ bash ~ ]
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1.1 date 下令的功能
体现或设置系统时间与日期。
转换时间到选定的格式，默以为当前。
1.2 date 下令的格式
date [OPTION]... [+FORMAT]
或
date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
1.3 FORMAT可用的转义序列
转义序列含义%%百分号%a本地缩写的工作日名称（比方，Sun）%A本地完备的工作日名称（比方，Sunday）%b本地缩写的月份名称（比方，Jan）%B本地完备的月份名称（比方，January）%c本地的日期和时间（比方，Thu Mar 3 23:05:25 2005）%C世纪，和%Y类似，但是省略后两位（比方，20）%d一月中的一天（比方，01）%D日期，等价于%m/%d/%y%e一月中的一天，格式利用空格填充，等价于%_d%F完备的日期；等价于%+4Y-%m-%d%gISO标准计数周的年份的最后两位数字%GISO标准计数周的年份，通常只对%V有用%h等价于%b%H小时，范围（00..23）%I小时，范围（01..12）%j一年中的一天，范围（001..366）%k小时，利用空格填充，范围（0..23），等价于%_H%l小时，利用空格填充，范围（1..12），等价于%_I%m月，范围（01..12）%M分钟，范围（00..59）%n换行符%N纳秒，范围（000000000..000000000）%p用于表现本地的AM或PM，假如未知则为空缺%P类似于%p，但用小写表现%q季度，范围（1..4）%r本地以12小时表现的时钟时间（比方，11:11:04 PM）%R24小时每分钟；等价于%H:%M%s自协调世界时1970年01月01日00时00分以来的秒数%S秒数，范围（00..60）%t水平制表符%T时间；等价于%H:%M:%S%u一周中的一天（1..7），1代表星期一%U一年中的第几周，周日作为一周的起始（00..53）%VISO标准计数周，该方法将周一作为一周的起始（01..53）%w一周中的一天（0..6），0代表星期天%W一年中的第几周，周一作为一周的起始（00..53）%x本地的日期表现（比方，12/31/99）%X本地的时间表现（比方，23:13:48）%y年份后两位数字，范围（00..99）%Y年份%z+hhmm格式的数值化时区格式（比方，-0400）%:z+hh:mm格式的数值化时区格式（比方，-04:00）%::z+hh:mm:ss格式的数值化时区格式（比方，-04:00:00）%:::z数值化时区格式，相比上一个格式增加':'以体现必要的精度（比方，-04，+05:30）%Z时区缩写（如EDT）
1.4 date 下令的选项说明
