Nintendo Wii U/3DS/Switch - more maintenance planned for February 5-7

Services impacted
Nintendo Switch: online play (unspecified games)
Wii U: online play (unspecified games)
Nintendo 3DS: online play (unspecified games)

Times
Europe: February 6th (5AM to 10AM)
UK: February 6th (4AM to 9AM)
North America (EST): February 5th (11PM) to February 6th (4AM)
North America (PST): February 5th (8PM) to February 6th (1AM)
Japan: February 6th (1PM to 6PM)

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Services impacted
Nintendo 3DS: Pokémon Ultra Sun, Ultra Moon, Sun, Moon (online play)

Times
Europe: February 7th (1.50AM to 3.30AM)
UK: February 7th (12.50AM to 2.30AM)
North America (EST): February 6th (4.50PM to 9.30PM)
North America (PST): February 6th (1.50PM to 5.30PM)
Japan: February 7th (9.50AM to 11.30AM)

from GoNintendo