Dinner will be served within an hour

Question

I consulted Reverso for the translation of two propositions from this lesson:
1. Dinner will be served within an hour
2. Dinner will be served in an hour's time
Both produce the same french phrase: 
Le dîner sera servi dans une heure
My question: why Kwizbot showed error to my translation into English that read “Dinner will be served within an hour”

Céline Pickard · Accepted Answer

Bonjour Roman,
Le dîner sera servi dans une heure = Dinner will be served in one hour
-> "dans une heure" means the dinner will be served exactly or approximately one hour from now, pointing to a specific future time.
Le dîner sera servi en une heure = Dinner will be served within one hour
->"en une heure" means suggests the dinner could be served at any time before one hour has passed, emphasising a time limit rather than a specific point.
In French, "dans + [duration]" is used to indicate a specific point in the future, while "within" in English suggests an event occurring at any point during a given time frame. Therefore, you would use "en" with the latter, i.e. "within + [duration]".
I hope this is helpful.
Bonne journée !