Apparently WIPO has a page that lists the closed dates of patent offices  

https://www.wipo.int/pct/dc/closeddates/faces/page/index.xhtml

Here is the heading on the page.

IPO Closed Dates


Intellectual property Offices’ closed dates are furnished yearly by the respective Offices. They are then expanded and updated with subsequent information received by the International Bureau.


I didn't know about it and I thought others might be interested to know.

Martha Yates

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