The different days of the week

In French, weekdays can be used with the article “le” but also without.

—–> Without “le” (Dialogue 1)

To talk about the days to come or the past days, we do not use the article “le”.

In dialogue 1 further below, you will see that “le” is not used.

—–> With “le” (Dialogue 2)

To talk about a habit, to express a regularity the article “le” is necessary.

In dialogue 2, the article “le” is used because the person is talking about a habit. “Le” may be replaced by “chaque lundi” or “tous les lundis”.