Run a load test profile in absolute time?

Hi,

I wish to run a 24 hr soak test which has the following daytime\nighttime profile:

Daytime profile of X users runs between 0600 and 1800.
A Nighttime profile of Y users runs between 1800 to 0600.

How do I configure Neoload to allows this test to run in absolute time?. For example if i kicked it off at 3pm it runs the Daytime profile of X users. Then at 1800, it switches over to the nighttime profile of Y users.

Hope this makes sense.