Nintendo Switch/3DS/Wii U - upcoming maintenance sessions for July 3/4

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

Times
Europe: July 4th (2AM to 5AM)
UK: July 4th (1AM to 4AM)
North America (EST): July 3rd (8PM to 11PM)
North America (PST): July 3rd (5PM to 8PM)
Japan: July 4th (9AM to 12PM)

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Services impacted
Nintendo Switch: online play (unspecified games)

Times
Europe: July 4th (6AM to 8AM)
UK: July 4th (5AM to 7AM)
North America (EST): July 4th (12AM to 2AM)
North America (PST): July 3rd (9PM to 11PM)
Japan: July 4th (1PM to 3PM)

from GoNintendo