日期计算器
计算两个日期之间的天数差，支持日期加减运算。
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Date Difference
Add / Subtract Days
Day of Week
Include:
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About Date Calculations
Date calculations are essential for project planning, scheduling, and event management. The date difference tool counts calendar days between two dates. Enable "Business days only" to exclude Saturdays and Sundays.
Adding/subtracting days is useful for calculating deadlines — for example, "what date is 90 days from today?" The Day of Week tool lets you find what day any historical or future date falls on.