📌 适用场景

日期差计算器可算出两个日期之间相隔多少天、周、月，也能在某个日期上加减天数，适合算合同天数、倒计时、工龄、账期等。

📖 深入了解 Date Difference Calculator

Date Difference Calculator 把若干输入代入固定的数学公式，实时算出结果。相比手算或临时搭表格，在线工具省去记忆公式与处理单位的麻烦，输入即出，还能反向推导。

例如使用 Date Difference Calculator 时，把关键参数填入对应框，结果会即时更新；试着调整任一输入，就能直观看到输出如何变化，方便做「如果…会怎样」的推演。

Count the number of days, weeks and months between two dates. Includes an option to add or subtract days from a date.

Mode

Start Date

End Date

Select dates to calculate the difference.

🔒 All processing happens in your browser. No data is uploaded to any server.

Are both dates included?

The difference counts the number of days between the two dates. Add one day if you need to include both endpoints.

How are months counted?

Months are approximate (average 30.44 days) for the summary; the day count is always exact.

Can I go backwards?

Yes. In add/subtract mode, enter a negative number of days to move to an earlier date.

日期差计算器是免费的吗？

是的，日期差计算器（Date Difference Calculator）完全免费，无需注册，打开网页即可使用，计算全部在你的浏览器本地完成，数据不上传。

日期差计算器支持哪些单位或格式？

支持公制与英制等多种单位/格式切换，输入即时出结果，适合日常、财务、健康等多种场景。

计算结果准确吗？

基于标准公式实时计算，结果可靠；建议作为参考，重要决策请咨询专业人士。

📃

Count the exact term of an agreement.

⏳

See how many days until an event.

💼

Work out billing periods and due dates.