Get the process pid using ‘ps’ and read off the timestamp in the corresponding subdirectory in /proc.
example :
# pgrep java
16949
# ls -ld /proc/16949
dr-xr-xr-x 5 root root 0 Mar 3 12:02 /proc/16949
OR more formatted like below 🙂
# ps -ef | grep java | grep ‘bootstrap.jar’ | awk ‘{print $2}’| tail -1 | xargs -i stat /proc/{} | grep Change: | awk -F’ ‘ ‘{split($3,a,”.”); print $2,a[1]}’
2009-03-03 12:02:25