Thanks for pic.
Thought your point about formatting had given me the answer. Although data was formatted to date, I had the header title in first cell of the column. Moved the column title into the top shaded bit and formatted the whole column to date, now cannot get anything to show on bottom axis.
Looking at help stuff, they show some toolbars at the very top, including an "insert chart" button, but cannot find how to show this and now see in your example that you do not have these toolbars either.
My data consists of a column of dates and one of blood pressure, the dates are not concurrent so from my excel experience this requires a scatter chart, otherwise dates are treated simply as labels and not values. Would be useful if you could send me a copy of a working chart, but forum will not let me post my address until I have 3 posts, so maybe next time.
I have used Excel for many years and after a lot of hard work have come to understand lots of stuff about the wide range of charts, so feeling very frustrated that I have to start all over again and without and USEFUL help or manual.