Template:Canals opened in YYYY category header
Canals opened in YYYY category header is used to create categories of the form "Canals opened in YYYY", where YYYY is a 4-digit year.
e.g.
It is not for use on other types of categories, e.g.
The template creates navigation tables and puts the page into the correct parent categories
Usage
{{Canals opened in YYYY category header}}
No parameters needed.