You have the following chart that shows the cumulative of sales from various dates.

You want the months to appear as shown in the following chart.

What should you do?
To ensure the dates are shown in a continuous axis, you should convert the date to a continuous field. This will display the months in a sequence without any breaks, which is needed for showing a trend over time like the cumulative sum of sales.
Jerry
1 month agoJose
1 month agoWillie
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3 months agoCharlesetta
3 months agoKeva
4 months agoYvette
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29 days ago