Bar property based on 'Time'

 

I know I am asking basic + stupid thing but I can’t help myself:

I need to refer to a concrete bar on the time line and get its properties.

For instance:

I would like to get a High (highest price of the bar), if, the only thing I know about the bar is it's coming from 2011.10.07 21:31 (let’s assume M1 graph).

Is it possible to get it directly or do I need to know index number of the bar first?

Thanks,

 
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