21 calendar days 日历日
calendar days 日历天
SET CALENDAR DAYS OFF 设置灌水日期终止
Days Means Calendar Days 天方法日历每天
He worked out that a year should be 365.24281481 days long and created the Daming Calendar.
他计算出一年应该是365.24281481天，并创造了《大明历》。
Give them a Chinese lunar calendar and they will know what the weather will be like days or even months later.
给他们一本中国农历日历，他们就会知道几天甚至几个月后的天气情况。
Days refers to 24-hour periods, not calendar days.
天指的是24小时的阶段，不是日历日。
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