What do you want to display in the title line ?
If you want to display the current date you should use this:
Activity.Title=DateTime.Date(DateTime.Now)
If you want to diplay the current date and time you should use this:
Activity.Title=DateTime.Date(DateTime.Now)&" "&DateTime.Time(DateTime.Now)
If you want to the date of tomorrow you should use this:
Activity.Title=DateTime.Date(DateTime.Add(DateTime.Now,0,0,1))
Best regards.