4 Bible Verses about Calendars

But of that day and hour no man knows, nor the angels of heaven; but my Father only.

but when the fullness of time came, God sent forth his Son, born of a woman, born under the law,

But he answered and said to them, When it is evening you say, It will be fair weather for the sky is red; and in the morning, It will rain to-day for the sky is red and lowering. You know how to distinguish the face of the sky, but you cannot distinguish the signs of the times. An evil and adulterous generation seeks a sign; and no sign shall be given it except the sign of Jonah. And he left them and departed.

The birth of Christ was thus. His mother Mary having been espoused to Joseph, before they came together, was found to be with child by the Holy Spirit.