Epoch or Unix timestamp and Date format
What is Epoch time ?
Unix time, or POSIX time is also know as Epoch time. Linux/Unix operating systems maintain system time based on some starting time called the Epoch. In Linux/Unix and POSIX systems count time as seconds since midnight Coordinated Universal Time (UTC) of January 1, 1970, not counting leap seconds. It is widely used not only on Unix-like operating systems but also in many other computing systems. Epoch time is in seconds!!
1] How to get Epoch time ?
* Linux / Ubuntu
root@arun:~# date
Wed Jan 28 23:52:12 IST 2009
root@arun:~# date +%s
1233166934
root@arun:~#
* FreeBSD
root@arun:~# date
Wed Jan 28 11:07:10 IST 2009
root@arun:~# date +%s
1233169634
root@arun:~#
2] How to convert Epoch time into Date format ?
* Linux / Ubuntu
arunsb@arun:~$ date -d ‘1970-01-01 1233167307 sec’
Wed Jan 28 18:28:27 IST 2009
arunsb@arun:~$
* FreeBSD
arunsb@arun:~# date -r 1233169468
Wed Jan 28 11:04:28 IST 2009
arunsb@arun:~#
3] How to convert Date time into Epoch ?
* Linux / Ubuntu
arunsb@arun:~$ date ; date +%s
Thu Jan 29 00:26:48 IST 2009
1233169008
arunsb@arun:~$ date -d ‘Thu Jan 29 00:26:48 IST 2009’ +%s
1233169008
arunsb@arun:~$ date -d ‘Thu Jan 29 00:26:48 IST 2009’ +%s
1233169008
arunsb@arun:~$
* FreeBSD
root@arun:~# date -j -f ‘%Y-%m-%d %H:%M:%S %Z’ ‘2009-01-29 00:50:04 PST’ +%s
1233219004
root@arun:~# date -j -f ‘%Y-%m-%d %H:%M:%S %Z’ ‘2009-01-29 00:50:04 GMT’ +%s
1233190204
root@arun:~#
Thanks,
Arun Bagul
2 Replies to “Epoch or Unix timestamp and Date format”
You certainly deserve a round of applause for your post and more specifically, your blog in general. Very high quality material
how to convert s/Oct/10/g in unix into epoch