Wallchart A4 size
This is a simple concept and possibly one that could be made by the teacher, but why bother, if we've already made it for you and it's relatively inexpensive. (Your time is more precious than that!)
It consists of a chart which has a sliding card with the days of the week on them, which can be changed as the week progresses.
The words we used are:
Today is : ..........
Yesterday was......
Tomorrow will be.......
This kind of display is invaluable in the classroom context! You could even appoint a calendar monitor!!