Calculating with the time

Hello All,

I am looking for an advice how to do calculation with the time. I do have a 
column with datatype 'timestamp with time zone'. The value is '2003-03-22 
07:53:56-07' for instance. I would like to select it from the table with 
result of '07:59:59' ? '07:53:56', so the query should return '00:06:03'.
Thank you for your time.

DanielD

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