starting from; the last time
Marks a point in time as the starting point or the last occasion of an action or state.
を限りに expresses a boundary: it marks the moment after which something will no longer happen or will begin. With a noun like 今日, it means 'starting from today' or 'with today as the last time'. When used with expressions like 今回, it conveys a sense of finality, often in farewell speeches or announcements. It is somewhat formal and is often used in written language or set phrases like これを限りに (with this as the last). The nuance is that the speaker is consciously drawing a line, and it often implies a change in life or a definitive end. It is not used for casual everyday scheduling.