Answer by Miguel for Difference in months between two dates

In case you just care about the month and year and want to touch both dates (for example you want to go thru JAN/2021 to AGO/2022) you can use this:

int numberOfMonths= (Year2 > Year1 ? ( Year2 - Year1 - 1) * 12 + (12 - Month1) + Month2 + 1 : Month2 - Month1 + 1); 

Example:

Year1/Month1: 2021/10   Year2/Month2: 2022/08   numberOfMonths = 11;

Or same year:

Year1/Month1: 2021/10   Year2/Month2: 2021/12   numberOfMonths = 3;

If you just want to touch one of them remove both + 1.