Meaning: in, at, on, to
How to use the: Noun + に
When we want to talk about a time when certain actions occur, we add the adjective 「に」 and after the noun indicating time. Use 「に」 for actions that occur for a short time. 「に」 is used when the noun of time has an accompanying number. However, in case of weekdays, you can use or not use 「に」
7-Ji ni okimasu.
I get up at 7 o’clock.
2 Tsuki 1-nichi ni Nihon e ikima shita.
I went to Japan on February 1st.
Shūmatsu `ni’ tomodachi no ie e ikimasu.
Weekend I (will) go to your home