In At and On - Prepositions of time and place
...
LanguageLearningBase.com (short: llb.re) is an online community for learning foreign languages.
It represents an open knowledge base. Every member can share and gain knowledge about a new language.
In At and On - Prepositions of time and place
The prepositions in, on, and at can be used to indicate time and place.
Prepositions of Time
When we say last, next, every, this we do not also use at, in, on.
Examples: I went to London last June. I go home every Easter.
Prepositions of Place