Meaning of this line

This is SQL 2000. Does this line mean subtracting 8hours or 45 minutes??

DateAdd(minute,-45, '2011-04-11 18:26:44.137')

I think it's subtracting 45 manager says it's subtracting 8 hours
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See BOL:
Returns a specified date with the specified number interval (signed integer) added to a specified datepart of that date.

DATEADD (datepart , number , date )

DateAdd(minute,-45, '2011-04-11 18:26:44.137')
This means subtract, or take 45 minutes from the datetime value posted.

To get this:   2011-04-11 17:41:44.137

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>>I think it's subtracting 45 manager says it's subtracting 8 hours

You are correct.
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Microsoft SQL Server

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