easy way to loop over months and years from a given date

Question

I have been trying to write this loop and it just keeps getting more complicated. Basically I want to take a given date and loop through every month until I reach the curren

Answer 1

Generate a range (as IEnumerable`DateTime) of first days of a month in between of a given dates:

from range in new[] {
    new {
        start = new DateTime(2017, 6, 23),
        end = new DateTime(2018, 09, 11)
    }
}
select (
    from y in Enumerable.Range(
        range.start.Year, range.end.Year - 
        range.start.Year + 1
    )
    let ms = y == range.start.Year ? range.start.Month : 1
    let me = y == range.end.Year ? range.end.Month : 12
    select 
        from m in Enumerable.Range(ms, me - ms + 1)
        select new DateTime(y, m, 1)
).SelectMany(y => y)