This day counter calculator finds the number of days between two dates or calculates a future or past date by adding or subtracting days. It provides results in days, weeks, months, and years, and automatically adjusts for leap years and cross-year ranges.

Simple mode: Enter a start and end date to calculate the total days between them, with the option to include both start and end dates.
Advanced mode: Add or subtract any number of days from a given date to find the resulting date and day of the week.
Accurate results: Adjusts automatically for leap years, different month lengths, and year transitions.
Multiple units: Shows duration in days, weeks, months (approx), and years (approx).
Practical uses: Helpful for project deadlines, countdowns, event planning, age calculation, and scheduling reminders.

How to use: Choose Simple mode to enter two dates and count the days between them. Use Advanced mode to add or subtract days from a base date. The results update instantly with a clear summary including weekday information.

Common searches: day counter between two dates, how many days until event, add days to a date calculator, subtract days from date, days calculator online.

Day Counter Calculator

Count days between two dates or add/subtract days from a base date with quick date shortcuts.

How the day counter calculator works

The day counter calculator measures the total number of days between two dates or shifts a date forward or backward by a set number of days. It automatically accounts for leap years, month lengths, and year transitions.

Counting days between two dates

To count days between two dates, the calculator subtracts the start date from the end date. You can choose whether to include both dates in the calculation.

Example 1: From 1 January 2024 to 31 December 2024 → 366 days (leap year).
Example 2: From 15 March 2025 to 10 April 2025 → 27 days (exclusive), 28 days (inclusive).

Adding or subtracting days

In advanced mode, the calculator lets you add or subtract days from a base date. This feature is ideal for deadlines, countdowns, and event planning.

Example 1: 1 July 2025 + 100 days → 9 October 2025.
Example 2: 10 November 2025 − 45 days → 26 September 2025.

Common scenarios for using the calculator

The day counter is useful in education, business, travel, and personal life. Below are examples where day calculations are commonly needed:

Scenario	Input	Output
Project deadline	Start: 1 Feb 2025, End: 30 Apr 2025	89 days
Countdown to event	Today → 25 Dec 2025	Number of days until Christmas
Travel planning	Trip: 10 May 2025 to 20 May 2025	10 days
Add days	Base date: 1 Sep 2025 + 60 days	31 Oct 2025
Subtract days	Base date: 15 Aug 2025 − 30 days	16 Jul 2025
Leap year check	1 Jan 2024 to 31 Dec 2024	366 days

Day Counter Calculator FAQs

1. How do you calculate days between two dates?

To calculate days between two dates, subtract the start date from the end date. The calculator automatically counts leap years and month lengths. You can also choose to include both start and end dates in the total.

2. Does the day counter work with leap years?

Yes. The day counter adjusts for leap years automatically. For example, from 1 January 2024 to 31 December 2024 is 366 days instead of 365.

3. How do I add days to a date?

To add days to a date, use advanced mode. Enter a base date and the number of days to add. The calculator will return the new date along with the day of the week.

4. Can I subtract days from a date?

Yes. Subtracting days works the same way as adding. Enter the base date, choose subtract, and enter the number of days. The calculator will return the past date.

5. What units does the day counter show?

The calculator shows results in days and also gives approximate values in weeks, months, and years for better context.

6. What are common uses of a day counter?

Day counters are used for project deadlines, event countdowns, school or exam schedules, anniversaries, age tracking, and travel planning. It saves time by avoiding manual date calculations.