利用date将当前时间转换成秒数(从1970-01-01开始,到当前时间的秒数)
date +%s
将某一指定时间转换成秒数
date +%s --date="2014/7/15"
date +%s --date="2014/7/15 13:00:00"
date +%s -d '2014/07/15 13:30:00'
将某一特定的秒数转换成其对应的时间
date --date="@1405454400"
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'
----摘录自man page