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<!--
=== INPUTS TO THIS SUB-TEMPLATE ===
1 = year
noprint = if 1, do not print the year in the header (eg. noyear)
nocat = if 1, do not categorise the page (eg. noyearcat, disambiguation, [is subpage])
-->{{#if:{{SUBJECTSPACE}}
|<!-- all but main namespace = no action -->
|<!-- main namespace
Check if the input is blank or not
-->{{#if:{{{year|{{{1|}}}}}}|<!--if something, continue...
Check if the input is a number
-->{{#ifeq:{{is number|{{{year|{{{1|}}}}}} }}|1
|<!-- YES IT IS A NUMBER: perform as normal (nb: have to include years with digits below 4) -->{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}{{#ifeq:{{{nocat|}}}|1||[[Category:{{{year|{{{1|}}}}}} works]]}}
|<!-- NO IT IS NOT A NUMBER: more if statements and switches to select the right thing.
Now some checks to determine the type on non-numeric input:
-->{{#ifeq:{{{year|{{{1|}}}}}|?
|{{#ifeq:{{{noprint|}}}|1|| (unknown) }}{{#ifeq:{{{nocat|}}}|1||[[Category:Works of unknown date]]}}
|<!--ELSE check if the input "unknown"
-->{{#ifeq:{{{year|{{{1|}}}}}}|unknown
|{{#ifeq:{{{noprint|}}}|1|| (unknown) }}{{#ifeq:{{{nocat|}}}|1||[[Category:Works of unknown date]]}}
|<!--ELSE check if the input is a decade
-->{{#ifeq:{{is decade|{{{year|{{{1|}}}}}}|function=3}}|1
|{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}{{#ifeq:{{{nocat|}}}|1||[[Category:{{{year|{{{1|}}}}}} works]][[Category:Works of uncertain date]]}}
|<!--ELSE check if the input is a century
-->{{#ifeq:{{is century|{{{year|{{{1|}}}}}}|function=3}}|1
|{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}{{#ifeq:{{{nocat|}}}|1||[[Category:{{{year|{{{1|}}}}}} works]][[Category:Works of uncertain date]]}}
|<!--ELSE check if the input is Before Common Era (BCE)
-->{{#ifeq:{{is year|{{{year|{{{1|}}}}}}|function=3}}|1
|{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}{{#ifeq:{{{nocat|}}}|1||[[Category:{{{year|{{{1|}}}}}} works]]}}
|<!--ELSE check more complicated 2-part inputs
-->{{#if:{{#titleparts:{{{year|{{{1|}}}}}}|1|2}}<!-- if there is a 2nd part to the input, separated by a slash
-->|{{#switch:{{lc:{{#titleparts:{{{year|{{{1|}}}}}}|1|1}}}}<!-- check the 1st part -->
| c
| c.
| circa = <!-- year entered as "circa/YYYY"
-->{{#ifeq:{{Is year
| input = {{#titleparts:{{{year|{{{1|}}}}}}|1|2}}
| function = 3
}}
|1
|{{#ifeq:{{{noprint|}}}|1|| (c. {{#titleparts:{{{year|{{{1|}}}}}}|1|2}}) }}{{#ifeq:{{{nocat|}}}|1||[[Category:{{is year|input={{#titleparts:{{{year|{{{1|}}}}}}|1|2}}|function=1}} works]][[Category:Works of uncertain date]]}}<!-- ie. use the corresponding decade-based category for sorting this work with a "circa"-style date -->
|<!-- ELSE
-->{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}<!-- a "circa"-style date with a non-year 2nd part get categorised as unrecognised and undated -->
}}<!-- end ifeq isyear titleparts (2nd part) -->
| #default = <!-- ELSE
-->{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}<!-- if a multi-part date but no matches, categorise as unrecognised and undated -->
}}<!-- end switch titleparts (1st part) -->
|<!-- ELSE
-->{{#ifeq:{{{noprint|}}}|1|| ({{{year|{{{1|}}}}}}) }}<!-- if the input is STILL not recognised, categorise it as unrecognised and undated -->
}}<!-- end if titleparts -->
}}<!-- end ifeq year BCE -->
}}<!-- end ifeq century -->
}}<!-- end ifeq decade -->
}}<!-- end ifeq "unknown" -->
}}<!-- end ifeq ? -->
}}<!-- end ifeq isnumber -->
|{{#ifeq:{{{nocat|}}}|1||[[Category:Undated works]]}}
}}<!-- if value in parameter {{{year|{{{1}}}}}} -->
}}<!-- if SUBJECTSPACE -->
<noinclude>[[Category:Header templates|Header/year]]</noinclude>
