[amibroker] first/last 1-minute bar of each day

[dirk schreiber <tianatrading@xxxxxxxxx>]

hello group,
 
i want to simulate/backtest a system which closes all positions via MOC. how do i reference the LAST 1-minute bar for each individual day (sometimes my DB has 15:59, sometimes 15:58, sometimes 16:00 etc.)
and how would i code the FIRST 1-minute bar for the day?
 
thanks,
dirk 

 			
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