When the international date-line and midnight line up (once a day).
It is at midnight UTC on the International Date Line that the same calendar day is observed everywhere on Earth. At this point, the date changes from one day to the next for the entire planet simultaneously.
Not this year. Earth Day is the same date in the Gregorian calendar each year, and the Gregorian calendar is not synchronized with the lunar calendar at all.
You advance your calendar by one day at midnight, local time. This is when the date changes, regardless of whether you are moving or stationary on Earth's surface.
2001 had the same calendar as 2007 and 1871 had the same calendar as 1877.
The 1982 Calendar appears to be the same as 2010.
The date on the Hebrew calendar (10 Tishrei) stays the same, but being that the Hebrew calendar and the secular calendar run on different cycles, the English date will always slightly vary,
yes
2022 is the next year after 2011 to share its calendar.
The next calendar year in which the full moons will fall on the same date as they did in 2005 will be 2024.
2003... Even the date of Easter is the same.
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At the single instant in time when the calendar date is the same everywhere on earth, the time on the International Date Line is 12:00 midnight, and it's the beginning of that day on the east side of the line, and the end of the same day on the west side.