Setting a Specific Time on a Date variable?

[ragstta]

Hi All

i have two date variables

Dim dtDate as Date
Dim dtTime as Date

dtDate = "4/19/2007 15:00:00"
dtTime = "1/1/1900 18:00:00"

I want to set the time of dtTime on dtDate without changing the date
so that

Dim dtOutput as date

dtOutPut = "4/19/2007 18:00:00"

I know this is probably possible with string manipulation etc
is there a more cleverer way of doing this using .net functions etc!>??