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
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):
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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