4.2 Two Similar Calendars
Annual Zadok Calendar
The following is an annual Zadok calendar to illustrate how the calendar spans across a 12-month period. This exact cycle is repeated for 5 to 6 years after which the intercalation occurs in the next cycle. On the years 2026 and 2032, etc, there will be adjustments / intercalation.
Something to take note is that months 1,4,7 and 10 all start on Day 4. Also take note on the sequence of Sabbaths.

Hanke Henry Permanent Calendar
On 29 February 2020, the Washington Post had an article with a suggested new calendar (One that has been in the making for some time already).
Below is the suggested calendar from John Hopkins University known as the Hanke-Henry Permanent Calendar.

Note: The week start on Monday and end on Sunday (The new “Sabbath”). The extra week every 5 or 6 years is called “bonus week”.
Prof. Steve Hanke (economist) and Prof. Richard Henry (astronomer) are the creators of this calendar. The workings of this calendar show astounding similarities to the Zadok calendar.
The following is an excerpt from the referenced Wikipedia page for the Hanke Henry Permanent Calendar.
Notice how it deceives the uninformed person to have Sabbath on a Sunday together with all the other non-biblical holidays on the current Gregorian calendar.
Henry argues that his proposal will succeed where some others have failed because it keeps the weekly cycle perfectly intact and therefore respects the Fourth Commandment (Remember the sabbath day, to keep it holy) [3] of Judaism and Christianity.
(... except that the Sabbath is moved from the current day 7 to day 6 of the week...)
The creation of this universal “permanent” calendar could perhaps be the beginning of a universal religion. A quick google search on “universal religion” should confirm if this is something in the making or not.
Yahweh’s day of rest will be changed to another day. Let us have a look at other feast days of Yahweh that was already changed on the Gregorian calendar.