declare @startDate datetime
set @startDate = '03/12/2005 12:00:00'
declare @endDate datetime
set @endDate = '03/18/2005 12:00:00'
declare @result integer
SELECT @result= DATEDIFF( second, @startDate , @endDate )
select convert(varchar(5), @result/86400)+':'+convert(varchar(5),(@Result%86400/3600))+':'+convert(varchar(5),@Result%3600/60)+':'+convert(varchar(5),(@Result%60))
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