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
3 months agoJose
3 months agoWillie
3 months agoAlbina
3 months agoGianna
3 months agoVincenza
4 months agoChantell
4 months agoSelma
4 months agoKeneth
4 months agoLouvenia
4 months agoCharlesetta
5 months agoKeva
5 months agoYvette
5 months agoMarion
5 months agoCory
6 months agoDeja
6 months agoLeonora
6 months agoErnie
6 months agoShantay
6 months agoDorian
6 months agoEve
7 months agoTwanna
7 months agoPeggie
24 days agoRikki
2 months agoJonelle
2 months ago