The 1999 calendar has the same connection between dates and days of the week as the 2010, 2021 and 2027 calendars.
In 2021.
Since 1976, it only repeated in 2004 and will next repeat in 2032. It was a leap year and leap year calendars generally repeat every 28 years.
That will happen in the year 2030.
2014
2015 will be the same calendar as 2009.
The 2004 calendar will repeat itself in 2032.
The year 1999 will repeat in 2028.
As of 2018, the 2002 calendar will next repeat in 2019.
The year 2000 will repeat in 2028.
2019
The 2010 calendar repeated in 2021 and will next repeat in the year 2027.
The 2002 calendar repeated in 2013. It will next repeat in 2019.
In 2021.
The 1954 calendar repeated in 1965, 1971, 1982, 1993, 1999, and 2010. It will next repeat in 2021.
1954 Calendar repeats at 1965 .
1999 was not a leap year so it will not be repeated during the years 2016, 2020, 2024, 2028, 2032, 2036, nor 2040. That leaves 23 years that it can repeat 100%. The 1999 calendar started on a Friday. So, what years start on a Friday that are not any of the above years?
The 1971 Gregorian calendar repeated in 1982