This year, Purim and Pesach occur in the same Gregorian month.
Has this occurred previously? If so, when?
In 1999, the day of Purim fell out on the 2nd of March. This means that first few hours of pesach fell out on the 31st of March. Same happened in 1980, 1961....
The last time that Purim fell out on the 1st of March was in 1953 and so the first full day of pesach was on the 31st. The same will happen in 2029.
If you count places that read Megila on Shushan Purim, like Yerushalaim, then 2010 was the last time that they had Purim and Pesach in the same month.
This info is readily available here. All you have to do, is select the period you are looking for, in the drop down menu. It splits it up by 50 years, and you just look for the time that Purim starts on the 1st or 2nd of March.