In the last few centuries it has been more and more common to abbreviate dates to just the numbers of the day, month, and year. Often the year is just given as the last 2 digits since there is usually no need to mention the current century or millennium.
Of course there is some disagreement about which order to put the numbers for the day, the month, and the year. But I am going to use the USA system of month, day, and year. And I am going to use the Julian and Gregorian calendars and the Anno Domini calendar era. Anyone who wants to use other systems and point out when the 13th day of the 13th month of the year 1313 in some other system would have been, is free to do so.
So today is 02-22-2022. Or 02-22-22 leaving out the millennium and century. And if zeroes are omitted, today is 2-22-222. It has six of the same number, 2.
Back in the first millenium AD, the Anno Domini calendar era. was not invented until AD 525, and didn't become common for centuries later. Anyway, people didn't abbreviate numbers like in the present. So nobody could have know that the date was 1-1-1, or 09-09-09, or 09-09-99. The last date in the first millennium with five numbers the same should have been 09-09-999.
The last date in the previous (2nd) millennium with eight of the same number was 11-11-1111.
The last date in the previous (20th) century with seven of the same number was 11-11-1911. The last date with five of the same number should have been 09-09-1999 unless you ignore the extra "1" in 09-19-1999.
And the last date with six of the same date in this century and millennium was 11-11-2011, and the next date with 4 of the same number will be 03-03-2033. After that the next date with 4 numbers of the same number will be 01-01-2101, and the next with five of the same numbers should be 01-01-2111. The next with 7 of the same number will be 11-11-2111. And since months don't go over 12 or days over 31, it is impossible to have two 2s in the months or two 3s in the days. So it is impossible to have any higher number than 6 in the rest of the millenium, after 02-22-2222.
And I guess the first date with nine of the same number will be 11-11-11111.
The date with the most repetitions of a two digit number in the last century was 12-19-1919. The date with the most repetitions of a two digit number in the previous millennium was 12-12-1212.
The most recent date with 3 repetitions of a two digit number in this century was 12-12-2012. And it should be the last one until 11-11-2111. and 12-12-2112..
Of course there is some disagreement about which order to put the numbers for the day, the month, and the year. But I am going to use the USA system of month, day, and year. And I am going to use the Julian and Gregorian calendars and the Anno Domini calendar era. Anyone who wants to use other systems and point out when the 13th day of the 13th month of the year 1313 in some other system would have been, is free to do so.
So today is 02-22-2022. Or 02-22-22 leaving out the millennium and century. And if zeroes are omitted, today is 2-22-222. It has six of the same number, 2.
Back in the first millenium AD, the Anno Domini calendar era. was not invented until AD 525, and didn't become common for centuries later. Anyway, people didn't abbreviate numbers like in the present. So nobody could have know that the date was 1-1-1, or 09-09-09, or 09-09-99. The last date in the first millennium with five numbers the same should have been 09-09-999.
The last date in the previous (2nd) millennium with eight of the same number was 11-11-1111.
The last date in the previous (20th) century with seven of the same number was 11-11-1911. The last date with five of the same number should have been 09-09-1999 unless you ignore the extra "1" in 09-19-1999.
And the last date with six of the same date in this century and millennium was 11-11-2011, and the next date with 4 of the same number will be 03-03-2033. After that the next date with 4 numbers of the same number will be 01-01-2101, and the next with five of the same numbers should be 01-01-2111. The next with 7 of the same number will be 11-11-2111. And since months don't go over 12 or days over 31, it is impossible to have two 2s in the months or two 3s in the days. So it is impossible to have any higher number than 6 in the rest of the millenium, after 02-22-2222.
And I guess the first date with nine of the same number will be 11-11-11111.
The date with the most repetitions of a two digit number in the last century was 12-19-1919. The date with the most repetitions of a two digit number in the previous millennium was 12-12-1212.
The most recent date with 3 repetitions of a two digit number in this century was 12-12-2012. And it should be the last one until 11-11-2111. and 12-12-2112..
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