MS SQL 2k8 Datetime convert - not working - just past to the inet

dt.sql

DECLARE @myDouble float(30)
SET @myDouble = 40666.4704123611

DECLARE @myLong bigint
SET @myLong = 634400182498630741

-- o.k double to DateTime
select @myDouble as NR , convert(datetime, @myDouble) as DT


-- select @myLong as NR , convert(datetime, @myLong,) as DT

select with datetime

select * from tblevent as e
where e.tblEventExportDate = convert(datetime,'04.26.2011 15:58:58')