获得当天的时间范围(精确到毫秒)

Declare @i int,@t1 datetime , @t2 datetime;
select @i = 0, @t1 = getdate();
while @i<1000000
begin
declare @BeginDate datetime, @EndDate datetime
-- 方法1，用datediff
Declare @i int,@t1 datetime , @t2 datetime;
sel