Bộ đếm ngày

Count days between dates, days since or until a date, and countdowns to events. Handles leap years with step-by-step solutions.

Your Input

Format: YYYY-MM-DD

Must be on or after start date

Select a calculation type, enter your dates, and click Count Days to see results with step-by-step solutions and visualizations.

Hướng dẫn sử dụng hoàn chỉnh

Bộ đếm ngày là gì?

A day counter calculates the number of days between two dates, days since a past date, days until a future date, or a countdown to an event. It accounts for leap years, varying month lengths, and year boundaries.

Total days = End Date − Start Date  |  Business days = weekdays only (Mon–Fri)

Use it for project timelines, countdowns, age or tenure in days, and event planning.

Date Format

Use YYYY-MM-DD (e.g. 2025-02-15). Dates from year 1 to 9999 are supported.

Các loại tính toán

Ngày giữa

Exact number of days between two dates, plus weeks, months, hours, and business days (weekdays only).

Ngày kể từ

How many days have passed since a past date (e.g. since birth, since an event).

Ngày cho đến

How many days remain until a future date (deadlines, countdowns).

Đếm ngược

Countdown to an event with optional name; shows days, weeks, months, hours, and minutes until the date.

Cách sử dụng máy tính này

  1. Select a calculation type (Days Between, Days Since, Days Until, or Countdown)
  2. Enter the required dates (and optional event name for Countdown)
  3. Click 'Count Days' to see the result
  4. Review the main result, detail cards (when available), and step-by-step solution
  5. Use the chart for a visual breakdown where available
  6. Click 'Reset' to set all dates to today and clear results

Hiểu kết quả của bạn

Main result

The total number of days, with a short formatted summary (e.g. X days, or X weeks Y days).

Detail cards

For Days Between and Countdown: breakdown into weeks, months, business days, and hours where applicable.

Step-by-step

Shows how the day count was calculated, including formulas and intermediate steps.

Hiểu ngày làm việc

Business days are weekdays (Monday–Friday); weekends are excluded. Used for project deadlines, shipping, work schedules, and contracts. Holidays are not excluded.

Phương pháp đếm ngày

Simple subtraction: Total days = end date − start date.

Delta tương đối: Precise years, months, and days; accounts for month lengths and leap years.

Business days: Count of weekdays (Mon–Fri) between the two dates.

Ghi chú quan trọng

  • All calculations account for leap years and varying month lengths.
  • Business days (Days Between) exclude weekends only; holidays are not excluded.
  • Use YYYY-MM-DD format. Dates must be between year 1 and 9999.

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