日期计算器Date Calculator
计算两个日期之间的天数差Calculate the day difference between two dates.
关于 日期计算器About Date Calculator
计算“两个日期相差多少天”“某个日期 N 天后是哪天”，心算极易出错，跨月、跨闰年更是如此。本工具提供日期差计算与日期推算，基于真实日历规则，结果准确可靠，适合项目排期、合同期限、假期计算等场景。Computing "how many days between two dates" or "what date is N days from now" is error-prone mentally, especially across months and leap years. This tool offers date difference and date offset calculations based on real calendar rules — ideal for project scheduling, contract terms and leave planning.
使用方法How to Use
- 选择开始日期与结束日期，立即得到两者相差的天数。Pick a start and end date to instantly get the day difference.
- 或输入基准日期与天数，推算 N 天之前/之后的日期。Or enter a base date and a number of days to compute the date N days before or after.
- 将结果用于排期、期限核对等场景。Use the result for scheduling and deadline checks.
常见问题FAQ
计算会考虑闰年吗？Does the calculation account for leap years?
会。工具基于真实日历计算，自动处理闰年 2 月 29 日与大小月差异，无需人工判断。Yes. The tool computes on the real calendar, automatically handling Feb 29 in leap years and varying month lengths.
和 Excel 的日期相减有什么区别？How is this different from subtracting dates in Excel?
原理相同——都是把日期转为序号后做差——但本工具无需记公式、无需处理单元格格式，打开即用。The principle is the same — dates become serial numbers and are subtracted — but here there are no formulas or cell formats to wrestle with; it just works.
能换算成周数或月数吗？Can I get weeks or months?
天数是最精确的单位：7 天即 1 周可直接换算；“月”因长度不一，建议以天数为准并结合日历人工确认。Days are the exact unit: 7 days = 1 week converts trivially. Months vary in length, so prefer days and confirm against a calendar when needed.