Best Approach for Global Calendar

Anonymous , Not very clear. Why don't you create a calendar in power bi?

1.Creating Financial Calendar - From Any Month
https://community.powerbi.com/t5/Community-Blog/Creating-Financial-Calendar-Decoding-Date-and-Calendar-1-5-Power/ba-p/1187441
2.Any Weekday Week - Start From Any day of Week
https://community.powerbi.com/t5/Community-Blog/Any-Weekday-Week-Decoding-Date-and-Calendar-2-5-Power-BI-Turning/ba-p/1187482

or refer

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :radacad sqlbi My Video Series Appreciate your Kudos.

This link/video may be useful.

Creating a simple date table in DAX - SQLBI

Regards,

Pat