Usage
editTo add this template to, for example, Category:1910s births, use the following wikitext:
{{Birth decade category header|19|1|20th}}
The parameters are:
- All the digits of the decade except the last 2
- The next-to-last digit of the decade
- The century the decade is in, as an ordinal number (e.g., 1st, 2nd, 3rd, 19th, etc.)