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| {{#expr: | | {{#invoke:age|gsd}}<noinclude>{{documentation}}</noinclude> |
| <!--Days from all years past:-->
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| + (({{{year|{{CURRENTYEAR}}}}} - 1) * 365)
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| + ((({{{year|{{CURRENTYEAR}}}}} - 1) - (({{{year|{{CURRENTYEAR}}}}} - 1) mod 4)) / 4) <!--add a day for every leap-->
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| - ((({{{year|{{CURRENTYEAR}}}}} - 1) - (({{{year|{{CURRENTYEAR}}}}} - 1) mod 100)) / 100) <!--subtract 100 year exception-->
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| + ((({{{year|{{CURRENTYEAR}}}}} - 1) - (({{{year|{{CURRENTYEAR}}}}} - 1) mod 400)) / 400) <!--readd 400 year exception-->
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| <!--Days so far this year:-->
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|
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| + {{ #ifexpr: <!--add days for past months this year--> <!--Gives 1 or 2 extra days because of February-->
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| ({{{month|{{CURRENTMONTH}}}}} - 1) < 8
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| | ( ({{{month|{{CURRENTMONTH}}}}} - 1) * 30.5 round 0)
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| | ( ({{{month|{{CURRENTMONTH}}}}} - 1) * 30.5 + 0.9 round 0 )
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| }}
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| - {{ #ifexpr: ({{{month|{{CURRENTMONTH}}}}} <= 2) | 0 |
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| {{ #ifexpr: <!-- if leap year -->
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| ({{{year|{{CURRENTYEAR}}}}} / 4) = ({{{year|{{CURRENTYEAR}}}}} / 4 round 0) <!--If divisible by 4-->
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| and ({{{year|{{CURRENTYEAR}}}}} / 100 != {{{year|{{CURRENTYEAR}}}}} / 100 round 0) <!--and not by 100-->
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| | 1 | 2
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| }}
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| }}
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| + {{ #ifexpr: ({{{month|{{CURRENTMONTH}}}}} <= 2) | 0 |
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| {{ #ifexpr: <!--400 year exception-->
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| ({{{year|{{CURRENTYEAR}}}}} / 400) = ({{{year|{{CURRENTYEAR}}}}} / 400 round 0)
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| | 1 | 0
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| }}
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| }}
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| + {{{day|{{CURRENTDAY}}}}}
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| }}{{#ifexpr: {{{year|{{CURRENTYEAR}}}}} < 1 |
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| _ERROR - Can not handle dates before January 1, 1 A.D.
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| }}<noinclude>{{documentation}}</noinclude>
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