View source for Template:Year article header/zc

<includeonly><!--Zeller's congruence, modified -->{{#ifexpr:{{{1}}}>1582|{{#ifeq: {{#expr:{{{1}}} mod 100}} | 0 
 | {{#ifeq: {{#expr:{{{1}}} mod 400}} | 0 
  | a  {{W|leap year starting on {{#time:l|{{{1}}}-01-01}}|century leap year starting on {{#time:l|{{{1}}}-01-01}}}} 
  | an exceptional {{W|common year starting on {{#time:l|{{{1}}}-01-01}}}}}} 
  | {{#ifeq: {{#expr:{{{1}}} mod 4}} | 0 
   | a {{W|leap year starting on {{#time:l|{{{1}}}-01-01}}}}
   | a {{W|common year starting on {{#time:l|{{{1}}}-01-01}}}}}}}} of the [[Gregorian calendar]]{{#ifexpr:{{{1}}}<1923|&nbsp;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}}
{{Documentation}}
</noinclude>