https://www.polygon.com/2018/3/13/17113620/nintendo-switch-system-update-500-play-time-activity-fix-joy-con-de-syncing

Nintendo released a new system software update for the Nintendo Switch on Monday, adding some relatively minor features to the console. But there are some fixes and apparently some unannounced new features included as part of the update, numbered version 5.0.0, which will make a lot of Switch users happy.

One of the more important bug fixes in the system update relates to Play Activity. Switch owners noticed recently that their play time had been reset to zero in games they started playing one year ago, a bug related to the console’s calendar. This week’s update should fix that, according to Nintendo.