Everything that lives especially has a time; it lives and dies, according to its purpose. There is a sense in which certain kinds of time pass beyond the control of people. The purpose of the Incarnation, (and thus, the Cross and resurrection) is to re-orient human history and cosmic history around the saving acts of God. Man overcomes the futility of his short life by enfolding it into the "forever" that the victorious risen Christ ushers in. There is no warrant for changing the liturgical calendar based on the seasons in certain parts of the world, for example. It would make the liturgy subject to creation, and not the other way around. Jesus sees no contradiction in coming in the flesh to a particular place and time, but by His work, being the summation of everything. That is a worthy thing to ponder.