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).</noinclude>
| a [[leap year starting on {{#time:l|{{{1}}}-01-01}}|century leap year starting on {{#time:l|{{{1}}}-01-01}}]]
| an exceptional [[common year starting on {{#time:l|{{{1}}}-01-01}}]]}}
| {{#ifeq: {{#expr:{{{1}}} mod 4}} | 0
| a [[leap year starting on {{#time:l|{{{1}}}-01-01}}]]
| a [[common year starting on {{#time:l|{{{1}}}-01-01}}]]}}}} of the [[Gregorian calendar]]{{#ifexpr:{{{1}}}<1923| and {{Year article header/Julian start|{{{1}}}}}}}|{{Year article header/Julian start|{{{1}}}}}}}, the {{ordinal|{{{1}}}}} year of the [[Common Era]] (CE) and ''[[Anno Domini]]'' (AD) designations, {{Year article header/year number|{{{1}}}}}</includeonly><noinclude>{{Short description|Computes Zeller's Congruence to determine whether a year is a leap year}}