While the day is young

Photo of morning light
While the day is young means early in the day, when there is still plenty of time left to do things. People use it when they want to start something before the day becomes busy.

The expression comes from the idea of comparing the day to a living thing that begins young in the morning and grows older as time passes. The phrase has been used in English for many centuries.

Let's go for a walk while the day is young.