Translations:3DS:RTC black screen bug/5/en
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The database for Play Coins, gamecoin.dat, stores the date of your last earned Play Coin as an RTC date. When you earn a Play Coin for the first time after fixing the RTC, a gap of (usually) ~22 years is created when the 3DS stores the new Play Coin's date. When the system is next powered on after this, it detects the gap and starts listing every single date up to the new Play Coin's date.