Day 25. Let's meet at 8:00.
at [시간]
at 8: 30 at 6 o'clock
at noon at midnight
on [하루]
1. 날짜 [ on ]September 27 [on] May 15
2. 요일 [on] Monday [on] Friday night
3. 기념일 on your birthday / anniversary
in [하루보다 긴 ]
1. 월/ 계절 in April in the summer
2. 연도, 세기 in 2012 in the 19th century
3. 과거/ 미래 in the past in the future
#날짜와 요일 앞의 on은 생략 가능
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