They answers the question "when".
Exercises - Prepositions of time
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1) You wake up in at 6 o'clock.
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2) I was born in on 1993.
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3) My sister watches TV in at the evening.
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4) My father is on holiday in England in at the moment.
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5) I start the lesson at in 9 o'clock.
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6) We meet in on Tuesday.
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7) They visit their parents in at weekend.
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8) I start school in at September.
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9) She eats ice-cream at in summer.
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10) His birthday is in on August 15th.