To express an interval (from ... to ...) in French, you will use either de ... à ... or the contracted form du ... au ... (de + le ... à + le ...) depending on what follows.
1 - du ... au ... (literally: from the ... to the ...) is used when the definite article le is normally present in French:
- between two dates
Le festival dure du 24 juillet au 5 août.The festival lasts from the 24th of July to the 5th of August.
Note that, like for dates in general, you don't use ordinal numbers (except for 1st: premier) and you don't need the of in front of the month.
See Expressing dates in French
- between two days of the week in a repetitive context (e.g. from Mondays to Fridays):
Cet athlète s'entraîne du lundi au samedi, toutes les semaines.This athlete trains from Mondays to Saturdays, every week.
Note that you use the singular form of the day. You never say des lundis aux vendredis
See Using le with days of the week + weekend
2 - de ... à ... (literally: from ... to ...) is used in cases where le is not present in French:
- between two times:
See Telling time in French - simple
- between two months:
- between two days of the week in a one-time, specific context (e.g. from Monday to Friday):
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