What a date template turns out to be a series OF — see AutoFill.Date.
A template is read at its LARGEST unit: Jan 2020, Jan 2021 is a year series and not the twelve-month one it also is, which is what a surface has to name it as.
Jan 2020, Jan 2021
Readonly
A month series whose values all fall on their month's LAST day — Jan 31, Feb 28, Mar 31, which continues Apr 30 rather than Apr 28.
Jan 31, Feb 28, Mar 31
Apr 30
Apr 28
The unit each step counts.
What a date template turns out to be a series OF — see AutoFill.Date.
Remarks
A template is read at its LARGEST unit:
Jan 2020, Jan 2021is a year series and not the twelve-month one it also is, which is what a surface has to name it as.