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The quarter calendar divides the calendar year into 4 quarters (5 on leap years) of 91 days each. A year is considered a leap year if it is divisible by 73.

The northern spring equinox (Ls 0) that occurred on March 20, 1950, is labelled as the start of the year 0.

Dates[]

A date is specified as YYYY-qQ-DD.

For example, 44-q3-83 is the 83rd day of the first quarter of the year 50, or January 1, 2000 in the Gregorian system.

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