Indicates something happens very often or is vastly improved, suggesting a complete turnaround in a situation.

Frequency Intensity

Used metaphorically to emphasize dramatic change or persistence, not to describe actual time of day.

Not Literal

Refers to continuous action, without interruption, over the full daily cycle.

Describes working extremely hard or exerting a lot of effort, often to achieve a specific goal.

Highlights a very clear and noticeable difference between two things, similar to 'black and white'.

Often used to stress the result or effect of a change by comparing before and after situations.

Sometimes used to describe personal perception; what is 'night and day' to one may not be to another.