From what I can gather, several large earthquakes have altered our realisation of time on Earth. It is complicated to render in so many words. Recently, the earthquake in Chile & Japan have caused some serious misalignment to the axis upon which planet Earth rotates. This means, that a lot of strange differences may occur which won't be immediatly noticable. The most concerning is that seasons may occur at different intervals which you would usually rely upon the standard calendar for. Given the fact that weather has changed so much in recent years, this is going to make things like farming and weather reliant operations, basic life even harder to gauge.