This is the 30th most frequent Slovenian word.
danes
"Danes" means "today" in English.
The word 'danes' here is used as an adverb indicating the time at which the statement applies; in this case, it specifies the day on which the observation of the weather being beautiful is occurring—namely, today.
Danes je lep dan.
Today is a beautiful day.
Here, 'danes' is used again as an adverb of time, operating as a temporal reference to guide the topic of the planned activities happening today.
Kaj bomo danes počeli?
What are we going to do today?
In this sentence, 'danes' functions as an adverb modifying the timing when the movie is being shown, specifically today.