Hey there,
I'm currently using the below formula to pull in and report the availability of our consultants on a per week basis. The formula sits in a Smartsheet that references another Smartsheet where the data is in two columns from a start date to an end date every week that Consultant is booked. The Smartsheet utilizing the formula displays a nice single number out of 40 per week. This number is the hours the Consultant is available that week.
The issue that's arising is that in the transition from the last week of 2020 to the first week of 2021 the data becomes off by 1 week. Not sure what is going on or if I did the formula incorrect. However, the data prior to 2021 is pulling correctly.
Below are screenshots and also plaintext of formula below.
=40 - (SUMIFS({Forecasts (SS) Hours}, {Forecasts (SS) Consultant}, $[Consultant Name]25, {Forecasts (SS) Start}, WEEKNUMBER(@cell) = 1, {Forecasts (SS) Cancelled}, 0, {Forecasts (SS) Start}, YEAR(@cell) = 2021))

