You just have to change the time in addition to the date.
You don't mention how your time system works, so assuming you're using a JavaScript Date object, then you would do something like this:
<<set $CurDate.setDate($CurDate.getDate() + 1)>>
<<set $CurDate.setHours(7)>>
<<set $CurDate.setMinutes(0)>>
<<set $CurDate.setSeconds(0)>>
That will advance the day by one, and set the time to 7AM.
Hope that helps! :-)