If your EDD window goes across end of quarter (i.e., end of March, June, Sept, or Dec) Tesla tends to set the end of EDD to end of the quarter date instead of just straddling two quarters. This is not a steadfast rule though. Many of my EDDs went from Dec to Jan. But many others have seen it ending at the end of the quarter. Given that the OP is in Northern California, it is quite possible the Y will be delivered during end of quarter push (if Tesla is still doing that). Or may slip into April (like mine did from Dec to Jan). With Teslas and EDDs no one knows for sure including Tesla.