The most commonly used particle in conjunction with time is the に-particle. Up until now, you have used this particle to show presence at or movement towards a destination. In addition to that usage, it also means at when following a time.
|I bought the tickets at eight o'clock.||私 は 八時 に チケット を 買いました。watashi wa hachiji ni chiketto o kaimashita.|
|She went to New York in February.||彼女 は 二月 に ニュー ヨーク に 行きました。kanojo wa nigatsu ni nyuu yooku ni ikimashita.|
|Would you like to do something on Friday?||金曜日 に 何か しません か？kinyoubi ni nanika shimasen ka?|
Note that though に is used with the time expressions including hours, weekdays and months. There are other cases in which they are not used together with a time expression, as in the sentences below which you have learned earlier.