Elohim could have said that a day to Him is as a million years, yet He said that it’s as a thousand years to Him, a week of years (7,000 including the millennial reign of Jesus Christ) for biblical chronology from the six days of creation until the time of the new heaven and earth (after His millennial reign). The seven Jewish feasts are corroborative of this prophesied timeline, the seventh the Feast of Tabernacles which will be celebrated every year during His millennial reign (prophesied in Zechariah 14), the time of year when incarnated Jesus was born in Bethlehem.