date demo:
实例:
$>date
Mon Dec 7 15:43:39 CST 2009
#格式化输出
$> date +"%Y-%m-%d"
2009-12-07
#时间游走 当前时间 2009-12-07
# year , month , day ,hour , minute,second - ago
#昨天输出
$> date -d "1 day ago" +"%Y-%m-%d"
2009-12-06
#2秒后输出
$> date -d "2 second" +"%Y-%m-%d %H:%M.%S"
2009-12-07 15:50.04
#传说中的 1234567890 秒
$>date -d "1970-01-01 1234567890 seconds" +"%Y-%m-%d %H:%m:%S"
2009-02-13 23:02:30
#其他格式的转换
date -d "$(echo "03/Nov/2009 11:04:28" |perl -ne 'print "$2 $1 $3 $4\n" if /(.*?)"/(.*?)"/(.*?) (.*)/;') " +%Y-%m-%d
2009-11-03
#普通 转格式
$> date -d "2009-12-12" +"%Y/%m/%d %H:%M.%S"
2009/12/12 00:00.00
#apache 格式转换
$>date -d "Dec 5, 2009 12:00:37 AM" +"%Y-%m-%d %H:%M.%S"
2009-12-05 00:00.37
#格式转换 后时间 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
#时间差
#一小时 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")
$>echo "时间差$[($et-$st)/86400]天，$[($et-$st)/3600%24]小时"
时间差1天，1小时
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
整理 www.blogjava.net/Good-Game