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. First, add temporary tracking category (unless nocat is true) -->{{#ifeq:{{{nocat|}}}|1||[[Category:Works with non-numeric dates]]}}<!-- 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]]}} }}<!-- end ifeq "unknown" --> }}<!-- end ifeq ? --> }}<!-- end ifeq isnumber -->
|{{#ifeq:{{{nocat|}}}|1||[[Category:Undated works]]}}
}}<!-- if value in parameter {{{year|{{{1}}}}}} -->