It implied to change the time in the game. Didn't say a thing about changing OS time.
And I'm just questioning how this had anything to do with Nintendo's OS. You blamed them for something that isn't even a problem on their part.
Common sense, based on how consumer electronics and gadgets work today outside of Nintendo's bubble, says that it would have changed the system's time. If this would have been too much trouble to implement, which is fine if that's the case, better solutions Animal Crossing could have offered would have been:
1) Pop up a button that minimizies the game and takes you to the system menu where you could set the time and date and then press go back into the game.
2) Tell you to press home and change the time before proceeding with the game.
3) Simply tell you that this would not change your system's time.
It is certainly something Nintendo is accountable for. This is a game published AND developed by Nintendo. Even if it wasn't, they would still be partly accountable for (presumably) not allowing developers a way to access certain system features like the smartphones, computers, tablets, and most everything else does.
Anyway, the issue itself isn't a big deal, it's just problems like these (of which there are many) get under my skin and leave me bewildered as to what Nintendo is doing. Their quirkiness is usually endearing but when it's just a flat out poor design choice or something they overlooked/never understood in the first place then it can be pretty obnoxious.