Which then does not coincide with the calendar we use today.
We use two calendars in one.
The Biblical calendar has the pagan calendar days noted too.
Now they’ve added in the Rabbinical calendar too, so it’s getting a little harder to read, but it works.
Its just a little funny to be turning a page in the middle of the pagan month.
But we have to give up this world to be ready for Yehova’s kingdom.
So what? One cannot watch the new moon in the spring and see the barley is aviv? Actually, the Karaites (and others) do precisely that. The rest follows easily. I mark the Holy Days without much effort at all, except that one might find it easier if one is accustomed to taking one's bedtime tea out on the porch looking at the sky and talking to the Father (try it sometime... awesome for peace...).
You are no slacker, SkyDancer... You can figure this out - According to YHWH's calendar, the temple fell twice on the same exact day 500 years apart... I believe that very same day is when Jerusalem was plowed with salt too... According to YHWH's calendar, Torah was given at Sinai on the same day as Pentecost, all those many years apart... According to YHWH's calendar, the blood was first put on the doorposts in Egypt on the same day (I could argue the same hour) as Yeshua gave up His life those many years later. He is using HIS calendar, not ours. Study the prophets with that in mind, study events then and up to now, and you will be astonished at what you are missing.
PROOF abounds. That is why the Holy Days are still very important, and why Christian holidays mean exactly nothing.