In the doctrine of no arising does the past and future still exist, and if so do they exist in the same way as the present does?
And if not, why?
From Dogen's Genjo-koan:
Firewood becomes ash. Ash cannot turn back into firewood again. However, we should not view ash as after and firewood as before. We should know that firewood dwells in the dharma position of firewood and it has its own before and after. Although there is before and after, past and future are cut off. Ash stays at the position of ash and it has its own before and after. As firewood never becomes firewood again after it is burned and becomes ash, after person dies, there is no return to living. However, in buddha dharma, it is a never-changing tradition not to say that life becomes death. Therefore we call it no-arising. It is the laid-down way of buddha's turning the dharma wheel not to say that death becomes life. Therefore, we call it no-perishing. Life is a position at one time; death is also a position at one time. For instance, this is like winter and spring. We don't think that winter becomes spring, and we don't say that spring becomes summer.
I wondered whether Dogen is saying that there is a before and after and these are the same as the past and future that are cut off -- from the present: so that anything that occurs only does so in the past or future.