Personally I have found that if you want to predict when something will happen, like what day of what month of what year...there are methods to do it, but it's very hard to be accurate.
Not that the methods don't work in theory, just that timing is a bit fragile and flighty and hard to pin down, so much can change it.
Like let's say your Tarot predicted that someone was going to have some kind of serious talk with you that you were not looking forward to. If you asked when and it said next Tuesday. Next Tuesday rolls around and the person approaches you and where normally the conversation would ahve taken place then and there, they take one look at you and see you look upset/unhappy and decide that it is nto the time and place to have it just then. Then instead a week or two later when you are not longer thinking of it, then it will happen.
The timing of something can just so easily change, that I don't know if it truly can accurately be predicted with any method.
That is what my experieince seems to have shown me anyway,
Babs