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The day on which the Ring is finally destroyed is the 25th of March and the day on which the Fellowship commence their Quest is the 25th of December. [LotR Appendix B - Tale of the Years p.1069].
In historical Christian calendars these are the dates of the Birth of Jesus and the Crucifixion of Jesus. The fact that these dates are probably not the actual dates of these great events in Christ's life isn't really important, as what counts is the fact that the Church chose these dates to honour and celebrate them.
25th of December [or very close] is also the day on which Narsil, the ancient Sword of Elendil is reforged and renamed Andúril by Aragorn.
In one checks Christian history, it gives a more detailed account: [from Catholic Encyclopedia].
" All Christian antiquity [against all astronomical possibility] recognized the 25th of March as the actual day of Our Lord's death. The opinion that the Incarnation also took place on that date is found in the pseudo Cyprianic work "De Pascha Computus", c. 240.
It argues that the coming of Our Lord and His death must have coincided with the creation and fall of Adam. And since the world was created in spring, the Saviour was also conceived and died shortly after the equinox of spring. Similar fanciful calculations are found in the early and later Middle Ages, and to them, no doubt, the dates of the feast of the Annunciation and of Christmas owe their origin.
Consequently the ancient martyrologies assign to the 25th of March the creation of Adam and the crucifixion of Our Lord; also, the fall of Lucifer, the passing of Israel through the Red Sea and the immolation of Isaac. " [article here].
This understanding of the 25th of March has changed in more recent times within the Church, but it seems extremely coincidental that the start of the Quest begins on the traditional date of the Birth of Jesus, and the end of the Quest ends on the traditional date of the Death of Jesus. The day that Middle-earth is saved is on the same date that our own world has been saved.
This certainly provides the link or bond if you like, between Tolkien's mythology and traditional Christian understanding. When all of the other themes and parallels are weighed up and you add in this seeming coincidence, it does add credence to Tolkien's desire to pass truth, Christian Truth, through his story.
