What does "confines" mean in the following sentence?

"Little kids go to sleep early. The hours between, say, 5 p.m. and 8 p.m. are really central for parents. What if they spoke up about that more? Employers might then see the benefit of making clear to parents that they needn’t fulfill their work obligations within the confines of a traditional day."

See a translation

Be restricted to
Be limited to

In this case it means restricted to a certain time range that parents work.

Examples:

Employers might then see the benefit of making clear to parents that they needn’t fulfill their work obligations within the limits of a traditional day.
Employers might then see the benefit of making clear to parents that they needn’t fulfill their work obligations within the confines of a traditional day.
Employers might then see the benefit of making clear to parents that they needn’t fulfill their work obligations within the restrictions of a traditional day.