There are twelve months in a year. In the twelve months, February has twenty-eight days. In a leap year (闰年), it has twenty-nine days. A leap year comes every four years. The rest eleven months have thirty or thirty-one days.
There are three hundred and sixty-five days in a year. But there are three hundred and sixty-six days in a leap year.
There are seven days in a week. They are from Sunday to Saturday. Sunday is the first day of a week.
The parts of a day are morning, noon, afternoon, evening and night.