date demo:
實例:
$>date
Mon Dec 7 15:43:39 CST 2009
#格式化輸出
$> date +"%Y-%m-%d"
2009-12-07
#時間游走 當前時間 2009-12-07
# year , month , day ,hour , minute,second - ago
#昨天輸出
$> date -d "1 day ago" +"%Y-%m-%d"
2009-12-06
#2秒后輸出
$> date -d "2 second" +"%Y-%m-%d %H:%M.%S"
2009-12-07 15:50.04
#傳說中的 1234567890 秒
$>date -d "1970-01-01 1234567890 seconds" +"%Y-%m-%d %H:%m:%S"
2009-02-13 23:02:30
#其他格式的轉換
date -d "$(echo "03/Nov/2009 11:04:28" |perl -ne 'print "$2 $1 $3 $4\n" if /(.*?)"/(.*?)"/(.*?) (.*)/;') " +%Y-%m-%d
2009-11-03
#普通 轉格式
$> date -d "2009-12-12" +"%Y/%m/%d %H:%M.%S"
2009/12/12 00:00.00
#apache 格式轉換
$>date -d "Dec 5, 2009 12:00:37 AM" +"%Y-%m-%d %H:%M.%S"
2009-12-05 00:00.37
#格式轉換 后時間 游走
$>date -d "Dec 5, 2009 12:00:37 AM 2 year ago" +"%Y-%m-%d %H:%M.%S"
2007-12-05 00:00.37
#時間差
#一小時 3600
#一天 86400 秒
$>st=$(date -d "Dec 5, 2009 12:00:37 AM 1 day ago 1 hour ago " +"%s")
$>et=$(date -d "Dec 5, 2009 12:00:37 AM" +"%s")
$>echo "時間差$[($et-$st)/86400]天，$[($et-$st)/3600%24]小時"
時間差1天，1小時
date --help
Usage: date [OPTION]
[+FORMAT]
or: date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
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
-u, --utc, --universal print or set Coordinated Universal Time
--help display this help and exit
--version output version information and exit
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