在某年/月/季度前用in
具体某一天或某一天的上午/下午/晚上前用on
在时刻前用at
如
He was born in January.
He was born in January , 1998.
He was born on January 1st ,1998
He was born on the morning of January 1st , 1998
He gets up at 7:00 every day .
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