В конце дня я отдыхаю дома.

I

Breakdown of В конце дня я отдыхаю дома.

• день: the day
• дома: at home
• в: at

Questions & Answers about В конце дня я отдыхаю дома.

Why is it в конце дня and not something like в конец дня?

Because конце is in the prepositional case, which is required after в when you talk about being in/at a place or moment (not movement towards it).

• конец (nominative) → в конце (prepositional) = at the end
• дня is genitive singular of день and is used after конец:
  
  • конец чего? – конец дня – the end of the day

So the structure is:

• в
  • конце (prepositional) + дня (genitive)
    = at the end of the day

Why does дня end with -я here?

Дня is the genitive singular form of день.

The word конец often takes the genitive to show “end of something”:

• конец дня – end of the day
• конец недели – end of the week
• конец месяца – end of the month

In Russian, you don’t use an extra word like “of”; instead, you change the noun to genitive case.