Robin
At least here was Father’s day already 29. May this year, next year it will be 14. May. It is traditionally the 40ieth day after Easter, which means it is here always a Thursday, same day as christian feast of ascension, so it is always at a gesetzlicher Feiertag. [How do the English speakers distinguish Urlaub (holidays) from Feiertagen (holidays)?]
Windows is like a submarine. Open a window and serious problems will start.