In a year, the months of 1, 3, 5, 7, 8, 10, 12 are large, and the months of 3 1 day, 4, 6, 9, 1 1 are small.

24-hour timing method: 24 hours a day, 0:00- 12 at noon and 1: 00 at afternoon. The 24-hour timing method is 13: 00, and at night 1 till 24: 00.