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Place the preposition since before words or phrases denoting a point in time: since Monday, since yesterday, since eight o'clock, since Christmas. When we use since, the verb is usually in the present perfect tense, but it may be in the past perfect: I was glad to see Tom. I hadn't seen him since last Christmas.
From can also denote a point in time, but it must be followed by to or till: He works from eight o'clock till one o'clock without a break.
Use to to express motion from one place to another, use at to denote position.
Use on with the days of the week or month: on Friday, on March 25, on New Year's Day. Use at with the exact time: at four o'clock, at dawn, at noon, at sunset, at midnight. Use in with a period of time: in April, in winter, in 1945, in the morning. Also at night and by day.