Display month where only one month is in a range or display "YTD" if several months are...

Hello All,

In a column, I have a range of dates. Sometimes the dates will be all in one month (January) and other times it will contain dates from multiple months.

I would like a formula that looks at this range and if the data is all for one month, displays the month name (January) but where the data covers several months it displays "YTD".

Any ideas on how to do it, please?

Thanks