To get the exact start time of an old process, use below:
[steaua@TESTDB]/u01/app/oracle >ps -eo pid,lstart,cmd|grep 20734
20734 Wed Nov 17 01:59:02 2021 ora_pmon_TESTDB
Otherwise we'll get the year only:
[steaua@TESTDB]/u01/app/oracle >ps -ef|grep 20734 |grep -v grep
oracle 20734 1 0 2021 ? 00:41:46 ora_pmon_TESTDB
