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The Hanke–Henry Permanent Calendar (HHPC) is a proposal for calendar reform. It is one of many examples of leap week calendars, calendars that maintain synchronization with the solar year by intercalating entire weeks rather than single days. It is a modification of a previous proposal, Common-Civil-Calendar-and-Time (CCC&T).
Because evening out the lengths of the months is part of the rationale for reforming the calendar, some reform calendars, such as the World Calendar and the Hanke–Henry Permanent Calendar, contain a 30-day February. The Symmetry454 calendar assigns 35 days to February, May, August, and November, as well as December in a leap year.
A leap week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are proposed reforms to the civil calendar, in order to achieve a perennial calendar. Some, however, such as the ISO week date calendar, are simply conveniences for specific purposes.
Steve H. Hanke (/ ˈ h æ ŋ k i /; born December 29, 1942) is an American economist and professor of applied economics at the Johns Hopkins University in Baltimore, Maryland. [a] He is also a senior fellow at the Independent Institute in Oakland, California, [3] and co-director of the Johns Hopkins University's Institute for Applied Economics, Global Health, and the Study of Business ...
World Calendar and Hanke–Henry Permanent Calendar follow this with 31:30:30 and 30:30:31 days per month, respectively. On the other hand, Symmetry454 uses 4:5:4 weeks per month. They all result in 364 systematically distributed days and hence have to add either one extra and one leap day or a leap week.
No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.
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The Republic of China calendar, often shortened to the ROC calendar or the Minguo calendar, is a calendar used in Taiwan, Penghu, Kinmen, and Matsu. The calendar uses 1912, the year of the establishment of the Republic of China (ROC) in Nanjing, as the first year. The ROC calendar follows the tradition of using the sovereign's era name and year ...
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