Focus on many calendars, one earth as 2021 begins

There are over twenty different calendars in use or once in use in the world as shown below.
The effort to dig into this is to let people to understand that the Gregorian Calendar in use in most part of the world, is not the only regulator of man and his activities on earth.
The others which include the Gregorian are:
1. Gregorian Calendar
2. Pawukon Calendar (Bali, Indonesia)
3. Ethiopian Calendar
4. Jewish Calendar
5. Chinese Calendar
6. Heijira Calendar
7. Persian Calendar
8. Japanese Calendar
9. Julian Calendar
10. Buddhist Calendar
11. Hindu Calendar (Vikram Samvat, Shaka Samvat, and Kali Yuga)
12. Mayan Calendar
13. Egyptian Calendar
14. French Revolutionary Calendar
15. Sumerian Calendar
16. Zoroastrian Calendar
17. Celtic Calendar
18. Cappadocian Calendar
19. Achaemenid Calendar
20. Attic Calendar21. Ancient Greek Calendars.
As the rush to make it before December 31st, 2020 intensifies, let it be known that some persons residing in many other parts of the world could be less concerned about your rushing to meet up by the year end.
This is because these Calendars do not begin and end the same time.
Just bear in mind that man invented the calendar and over the years adjusted it, abandoned it or reinvented it to suit his purpose.
January 1st is not the beginning of the year for everyone on earth. Likewise, December 31st isn’t the end of the year for everybody on earth.
Always try to draw up a broad plan for yourself and pursue it throughout the days of your sojourn on earth and do not over worry your self about a particular calendar.