How to get the start time of a long-running Linux process?

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You can specify a formatter and use lstart, like this command:

ps -eo pid,lstart,cmd

The above command will output all processes, with formatters to get PID, command run, and date+time started.

Example (from Debian/Jessie command line)

$ ps -eo pid,lstart,cmd
  PID CMD                                          STARTED
    1 Tue Jun  7 01:29:38 2016 /sbin/init                  
    2 Tue Jun  7 01:29:38 2016 [kthreadd]                  
    3 Tue Jun  7 01:29:38 2016 [ksoftirqd/0]               
    5 Tue Jun  7 01:29:38 2016 [kworker/0:0H]              
    7 Tue Jun  7 01:29:38 2016 [rcu_sched]                 
    8 Tue Jun  7 01:29:38 2016 [rcu_bh]                    
    9 Tue Jun  7 01:29:38 2016 [migration/0]               
   10 Tue Jun  7 01:29:38 2016 [kdevtmpfs]                 
   11 Tue Jun  7 01:29:38 2016 [netns]                     
  277 Tue Jun  7 01:29:38 2016 [writeback]                 
  279 Tue Jun  7 01:29:38 2016 [crypto]                    
      ...

You can read ps‘s manpage or check Opengroup’s page for the other formatters.

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