día y noche

= round the clock, day and night, night and day, around the clock

Ex. The National Institute of Nutrition has a library which operates round the clock for students and research workers.

Ex. As those seeking information expect rapid service, day and night, publishers must be innovative and adapt to the challenges ahead.

Ex. And they worked night and day to make their dream come true.

Ex. Digitization is a value-added way of making library collections and materials available around the world, around the clock.

* * *

= round the clock, day and night, night and day, around the clock

Ex: The National Institute of Nutrition has a library which operates round the clock for students and research workers.

Ex: As those seeking information expect rapid service, day and night, publishers must be innovative and adapt to the challenges ahead.

Ex: And they worked night and day to make their dream come true.

Ex: Digitization is a value-added way of making library collections and materials available around the world, around the clock.