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> But will this work all the time?  Say you have a one minute IBM 
> chart, so I'd think Sess1FirstBarTime would be 931.  But suppose 
> on that day, it didn't open until 933 (imbalances, etc.). Then the 
> Time would be 933, so would this still work?
Good catch.  No, it wouldn't.  That's why Bob's suggested solution 
(if Date <> Date[1] then...) is a better answer.
Gary
 
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