Planner--international user availability by month
Does anyone happen to know exactly how monthly user availability is calculated in Planner?
I’m working on a utilization project with WF data pulled via API call. Three different schedules are in play for my user group--US, UK, and Malaysia. I’ve taken schedule weekdays, schedule holidays, and individual user PTO into account to calculate availability. When looking at monthly totals, my calculations for US and UK users match what’s shown in Planner. However, the totals for users in Malaysia are slightly off.
For example, here’s the November 2025 availability in Planner for one of users in Malaysia. The Malaysia schedule had no holiday exceptions that month, and this user had no PTO. November had 20 weekdays, so with a schedule of M-F 9-5, the available hours for the month should be 160, not 164:

If I switch the planner view from Month to Week, all the weeks in November (either fully in November or partially) correctly show an availability of 40.

I’m guessing differing time zones may factor into the discrepancy, but does anyone know exactly how the monthly totals are being calculated in Planner?