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Sumar o restar días

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.

Cómo usar

Elige la fecha de inicio, la cantidad, la unidad (día/semana/mes/año) y la dirección. La fecha resultante, el día de la semana y la distancia desde hoy se actualizan en tiempo real; si dejas la fecha vacía, se usa la de hoy.

Overview

Add or Subtract Days is a Time tool. 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

  • Daily use of Add or Subtract Days: Pick a start date, amount, unit and direction. Result, weekday and distance from today update live; leave the date empty to use today. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Add or Subtract Days offline or on poor network — all calculations stay local and private.
  • Exact age and total days
  • Timezone and timestamp conversion

How to use

  1. 1 Pick a start date, amount, unit and direction. Result, weekday and distance from today update live; leave the date empty to use today..
  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 “add days, date calculator” 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.
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