Parse ps' “etime” output and convert it into seconds

Question

These are possible output formats for ps h -eo etime

21-18:26:30
   15:28:37
      48:14
      00:01

How to parse them into se

Answer 1

Think I might be missing the point here but the simplest way of doing this is:

ps h -eo etimes

Note the 's' on the end of etime.