How to get the start time of a process

Hi, how to get from a Shell the date that was start a process?

Then command: "ps h -ostime $$"
show a value not usable for me (14:13 or May22 or 2009)

The command: "awk '{print $22}' /proc/$$/stat"
show The time in jiffies the process started after system boot (es
1563950) and I do not known how to convert it in date/time.

I want to find all processes older than n-days and send them a special
signal

Some suggest?

Many thanks

-- 
Dario Lesca <d.lesca@xxxxxxxxxx>

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