How do I get the current Unix time in milliseconds in Bash?
Solution 1:
This:
date +%s
will return the number of seconds since the epoch.
This:
date +%s%N
returns the seconds and current nanoseconds.
So:
date +%s%N | cut -b1-13
will give you the number of milliseconds since the epoch - current seconds plus the left three of the nanoseconds.
and from MikeyB - echo $(($(date +%s%N)/1000000)) (dividing by 1000 only brings to microseconds)
Solution 2:
You may simply use %3N to truncate the nanoseconds to the 3 most significant digits (which then are milliseconds):
$ date +%s%3N
1397392146866
This works e.g. on my Kubuntu 12.04 (Precise Pangolin).
But be aware that %N may not be implemented depending on your target system. E.g. tested on an embedded system (buildroot rootfs, compiled using a non-HF ARM cross toolchain) there was no %N:
$ date +%s%3N
1397392146%3N
(And also my (non rooted) Android tablet doesn't have %N.)
Solution 3:
date +%N doesn't work on OS X, but you could use one of
- Ruby:
ruby -e 'puts Time.now.to_f' - Python:
python -c 'import time; print time.time()' - Node.js:
node -e 'console.log(Date.now())' - PHP:
php -r 'echo microtime(TRUE);' - Elixir:
DateTime.utc_now() |> DateTime.to_unix(:millisecond) - The Internet:
wget -qO- http://www.timeapi.org/utc/now?\\s.\\N - or for milliseconds rounded to nearest second
date +%s000
Solution 4:
My solution is not the best, but it worked for me:
date +%s000
I just needed to convert a date like 2012-05-05 to milliseconds.
Solution 5:
Just throwing this out there, but I think the correct formula with the division would be:
echo $(($(date +%s%N)/1000000))