Template:Color by age/doc

This template is intended to visually indicate an age associated with some text via its background color. Starting one year after the specified date, the background color gets redder ("hotter") each year until after 4 years it is fully red. This can be useful, for example, for repetitive tasks in to-do lists to see what items haven't had editor attention for a while if users update the date every time they complete the task.

The template currently has five colored tiers:

 default background younger than 1 year lightyellow background older than 365 days (1 year) but less than 2 years yellow background older than 730 days (2 year) but less than 3 years orange background older than 1095 days (3 years) but less than 4 years</dd> <dt>salmon background</dt> <dd>older than 1460 days (4 years)</dd> </dl>

Example usage
which will render as

because the specified date is old enough to trigger the red background color. It also uses the optional note that is appended to the tooltip.