date

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代码:

$man date
NAME
       date - print or set the system date and time

SYNOPSIS
       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.

       -d, --date=STRING
              display time described by STRING, not ‘now’

       -f, --file=DATEFILE
              like --date once for each line of DATEFILE

       -r, --reference=FILE
              display the last modification time of FILE

       -R, --rfc-2822
              output date and time in RFC 2822 format

       --rfc-3339=TIMESPEC
              output date and time in RFC 3339 format.  TIMESPEC=‘date’, ‘seconds’, or ‘ns’ for date and time to the indicated precision.
       -s, --set=STRING
              set time described by STRING

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