Namaste Wil,
thank you for the post.
well.. not so much a time frame or date, per se. Buddha Dharma uses the metaphor of "crossing to the other shore" to indicate the change in ones mind stream once they have Awoken.
our tradition has two sorts of dharmas, normal dharmas and Buddha dharmas. Buddha dharmas are different than normal dharmas in that they are to be left behind once one reaches the Other Shore. essentially, the Buddha Shakyamunis teachings are meant to inculcate experience, not doctrine.
as such, once you have the experience, you no longer need the words about said experience
metta,
~v