Convert ps elapsed time format for long running processes

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1 
I'm trying to capture the ps elapsed time format for long running Siteminder process from remote server using Ansible playbook. The output of elapsed time is in the format of [[dd-]hh:]mm:ss. Need help to convert this time into seconds.
2

This is not really an ansible question but rather a linux shell question.

You can get the elapsed time in seconds using this one line shell command

$ ps -p 50 -o etime= | sed ‘s/[:-]/ /g;’ | awk ‘{print $4" " $3" " $2" " $1" " }’| awk ‘{print $1+$260+$33600+$4*86400}’
685608

3

Thanks a lot Tony.

I have updated the seconds conversion as below.
$ ps -p 50 -o etime= | sed ‘s/[:-]/ /g;’ | awk ‘{print $4" " $3" " $2" " $1" " }’| awk ‘{print $186400+$23600+$3*60+$4}’