ଛାଞ୍ଚ:Year article header zc

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This template is used by Template:Year_article_header to compute Zeller's congruence to determine if a year is a common or leap year, a leap year being divisible by 4 and not divisible by 100, or divisible by 100 and 400, and to indicate which day of the year it starts on and the year type (exceptional, leap, or common).