You said you need to keep something like 30 days, right?  Why convert at all?

What's wrong with this:

delete from mytable where mytime < max(mytime)-30

If you want to round it off to whole days:

delete from mytable where mytime < round(max(mytime)-.5)-30

Or is there something else you need to do?

Michael D. Black
Senior Scientist
Advanced Analytics Directorate
Advanced GEOINT Solutions Operating Unit
Northrop Grumman Information Systems

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