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When talking about time or durations introduced by in - in two hours, in 1876,... - in French you will either use dans or en.
Dans or en with time/durations in French
Here is how to know which one to use :
En une heure = (With)in an hour
En expresses the length of time something takes to be done.
Dans une heure = In an hour
Dans indicates the time until something will happen.
En 1998 / En octobre = In 1998 / In October
En is used with years and months.
You will never say : dans 1998 / dans octobre
See also how to pronounce years in French : Expressing dates in French
See also À + [heure] = At + [time] in French
and After/before versus in front of/behind (French Prepositions of Time and Place)
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