Get docker container start time in unix timestamp (seconds)

You can use the following command to get the start time of a docker container in a unix timestamp (seconds since 1970).

docker inspect --format='{{.State.StartedAt}}' <CONTAINERID> | xargs date +%s -d

Just replace <CONTAINERID> with the actual container id.

Or you can use this to get the start time of all your containers:

docker ps -q | xargs docker inspect --format='{{.State.StartedAt}}' | xargs -n1 date +%s -d