Save money for a rainy day.

Back in the days, people used to communicate through letters.

I work a five-day week.

The new fashion trend was just a nine days' wonder.

I always celebrate New Year's Day with my family.

I go for a run every single day.

Vernal Equinox Day is a national holiday in Japan.

I have been working late for three days in a row.

I need to take a day off from work.

I worked all day long.