Consecutive years of giving/membership

Hello! 

We went live with Tessitura this year and are beginning our YE reporting.  I was wondering how others calculate their consecutive years of giving and consecutive years of membership.  Do you take into account skipped year?  For example, if your fiscal year is calendar year and the donor gives in Dec19 and Jan21, is that still considered consecutive for 2020?

And, what are you using in Tessitura to obtain this info?  Do you have any samples?

I'd really appreciate any and all help and tips/tricks.

Thanks so much!
Trini