How do I display the day of week with date?

I want to show the day of the week (Mon, Tues, etc) with the date in the same or adjacent field. I thought we used to be able to show it that way in the past.

I thought we used to be able to show it that way in the past.

Earlier everything was better…

Choose Format>Cells from the menu:

Thanks, together with the first hint, it worked fine.

Format code DDD YYYY-MM-DD for example.

Thanks, it worked fine with the help of the next hint