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Máy tính cộng/trừ ngày

Date add/subtract tool: add or subtract days, weeks and months from a date handling month-end and leap years for scheduling, with one-click copy and offline.

Cách sử dụng

Pick a start date, amount, unit and direction. Result, weekday and distance from today update live; leave the date empty to use today.

Overview

Add or Subtract Days is a time tool that Date add/subtract tool: add or subtract days, weeks and months from a date handling month-end and leap years for scheduling, with one-click copy and offline. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Exact age and total days
  • Timezone and timestamp conversion
  • Date diff and workdays
  • Birthday and lunar reminders
  • Use it to cross-check “日期加减、add days” in reports, docs or APIs to avoid manual conversion errors

How to use

  1. 1 Pick start and end dates
  2. 2 Toggle inclusive and workdays
  3. 3 View weeks/months/hours breakdown
  4. 4 Copy or add to calendar

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Seconds vs milliseconds timestamps
  • Workdays need holiday data
  • Feb 29 birthdays vary by locale

FAQ

Lunar supported?
Yes, lunar input auto-converts to Gregorian.
Why different ages?
Years-old vs nominal age differ by region.
How is Add or Subtract Days different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “日期加减、add days” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
Tip：Tip: Bookmark this page or pin the tab; find related tools via categories and search (convert → calculate → export).
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All calculations run locally in your browser; nothing is uploaded.