I have been dealing with the meaning of this particle and its usage. When telling the time following by a verb, this particle is used. The following sentence clarifies above: わたしは まいにち ７じ に おきます。 [Everyday I wake up at 7.] But when should I use this particle. Is it every time a time [hour] is followed by a verb? I mean. Is it okay if I write this: わたしは まいばん １０じ に はたらきます。[I work every night at 10.] This does not sound right to me. However, I believe the particle is in the right place as any word. What would be the exact translation\meaning of this particle in this case? And why when I say わたしは まいにち ７じから １０じまで はたらきます, the に particle is never used? Thank you for your feed back.