And today on God’s calendar was His Day of the New Moon,the 1st day of His 6th month in the days of Noah, or His 12th month, in the days of Moses.
And the answer to why the New Moon Day was taught to be different than His 6 Work Days and Sabbath has the answer in Genesis 1:1, John 1:1 and John 1:14.
You know, nobody is interested in your weird obsession with calendars.
I honestly don’t know what point you are trying to prove with it because even YOU have to live your life around the current calendar we use to manage in this world.
If you are going to do banking, healthcare, shopping, pay bills, or any of a plethora of everyday life doings, you have to use it. And you are NEVER going to change the whole world to your obsession with something as irrelevant to most people as the calendar they use.
You are not more spiritual, or right, or holier than anyone else because of your touting it. There are far bigger moral issues in this world to address than dates and they are not going to be fixed with changing what you call days or what year it is.
And since neither God nor Jesus made an issue of it, I doubt it’s going to earn us more favor with God if we use the one YOU think we should instead of a different one. Because the long and short of it is, you can’t prove that He approves of YOUR version of it either.