Is there a recorded date for the BLessed Mother's birhtday and year as well as the day She ascended into heaven with a year?

There is no history data for an exact day , date, or even an exact year.
Even the birthdate for christ is only a picked date since no one knows, but it is pretty sure it was not in Decemenber

But there are days picked by the church to celebrate these, these links will give you a lot of info


http://www.americancatholic.org/Features/SaintOfDay/default.asp?id=1132


http://www.americancatholic.org/Features/SaintOfDay/default.asp?id=1108

Er, pardon me, but isn't the assumption of Mary a fairly recent addition to Catholic dogma? Maybe those who dreamed this up can supply you with a date.

mkmerenda
I think that Fr_Chuck gave you the best answer possible.
Peace and kindness,
Fred