日期计算器 (天数间隔, 持续时间, 推算)

轻松计算两个日期之间的持续时间，或通过添加天、周或月来确定截止日期。

即时计算日期之间的天数或查找未来截止日期。

多功能日期计算器工具。查找两个日期之间的确切天数、周数和月数，或通过向开始日期添加天数来计算截止日期。

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Your Free Days Calculator & Date Counter

Need to count days between two dates, figure out what date is 90 days from now, or calculate a deadline? This date calculator handles all common calendar math instantly. Enter your dates, get your answer—no sign-up, no server processing.

Eliminating Mental Calendar Math

Manually calculating the exact number of days between February 14th and October 31st across different years is highly prone to human error, especially when factoring in leap years or irregular month lengths. Our Date Calculator offloads this arithmetic to a mathematically flawless browser engine.

Two Modes: Days Between & Add Days

This tool is built for two distinct workflows:

  1. Date Counter (Days Between): Input a start and end date to instantly see the total days, weeks breakdown, and full year/month/day decomposition between them. Perfect for project timelines, contract durations, event countdowns, or answering "how many days until..." questions.
  2. Day Calculator (Add/Subtract): Enter a start date and a number of days, weeks, or months to project forward or backward. Ideal for deadline planning ("What date is 60 days from today?"), billing cycles, due dates, and notice periods.

Common Questions This Calculator Answers

  • How many days between two dates?
  • What date is 30 / 60 / 90 days from today?
  • How many days until Christmas, a wedding, or a deadline?
  • When does a 14-day return window or 60-day notice period end?
  • How many days have I been alive?

The Leap Year Guarantee

Because this tool natively leverages your browser's underlying Date object API rather than a hacky server-side script, it inherently understands the complete Gregorian calendar. It flawlessly accounts for February 29th leap years, 30-day months, and varying month lengths without error.

核心功能

  • 日期差异: 计算两个日期之间的确切天数，或年、月、日的细分。
  • 添加或减去时间: 找出30天后的日期，或5周前的日期。

常见问题

计数中包括结束日期吗？

“天数间隔”计算通常计算持续时间，因此实际上不包括开始日期，但包括结束日期（反之亦然）。它测量时间跨度。

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