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That is useful to discover the start time of process older than 1 day.
You can also run:
ls -ld /proc/PID
That's returning the creation date of the proc files from the process. Some users reported that this way might show you a wrong date since any other process like cron, for example, could change this date.
You can ran this also with cat for example:
tar zcvf - /folder/ | ssh root@192.168.0.1 "cat > /dest/folder/file.tar.gz"
Or even run other command's:
tcpdump | ssh root@10.0.0.1 "cat > /tmp/tcpdump.log"