Here's how it works:
* "Moins" means "less".
* "Et quart" means "and quarter", referring to a quarter of an hour (15 minutes).
For example:
* "Il est trois heures moins et quart" means "It is 2:45" (3 hours minus 15 minutes).
It's important to note that this way of telling time is more common in some parts of the French-speaking world than others. In some regions, they might use "moins le quart" or "moins un quart" instead.