This timeline attemtps to collate all the dated events referred to in the visual novel series "Umineko no Naku Koro ni" with the intent to make sense of the confusing and convoluted narrative. Due to how very few events are given any kind of precise dating in the novel, most dates are presented as time spans during which they could have occurred. Zoom with mouse wheel (zooms are separate for the lifetimes band and the events band) and drag the bands around with mouse.
WARNING: Contains spoilers of pretty much everything, if you're afraid of them... too late.