在线免费日期计算器

Enter both dates in the calculator to get the exact count including the exact number of years, months, and days between them. The difference considers leap years and varying month lengths automatically.

Enable "Exclude weekends" to count only Monday–Friday. Enable "Exclude public holidays" (select your country) to also remove national holidays from the count. This gives accurate business day duration.

Enter today's date and add 90 days in the date addition mode. The calculator accounts for month lengths and leap years to give you the exact target date.

Use the date difference calculator with your birthdate as the start and today as the end. For a dedicated age calculator with birthday countdown, use the Age Calculator tool.

February 29 is included in the count for calculations spanning leap years. If you add one year to Feb 29, the result is Feb 28 of the following year (since Feb 29 doesn't exist in non-leap years).

Yes, the 日期计算器 on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

计算日期之间的天数，对日期进行加减运算。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The 日期计算器 runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The 日期计算器 processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the 日期计算器 works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

Yes. The 日期计算器 uses your browser's built-in time zone data, which includes daylight saving time rules for all supported time zones, keeping results accurate year-round.

The 日期计算器 uses your browser's built-in Intl and Date APIs, which automatically account for daylight saving time transitions, leap years, and regional time zone rules. You do not need to make any manual adjustments for these calendar events.

Yes. The 日期计算器 is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.