DAYS CALCULATOR
Find the exact duration between two dates and times.
Duration Calculation Results
Alternative Time Units
What You Can Do with Date Calculators
The date calculators and calendar tools allow you to perform many useful time-related calculations. Below are some common ways people use them.
1. Count Days or Measure the Length of an Event
The Date-to-Date Calculator can determine how long an event lasted:
Enter the event’s start date in the Start Date section.
Enter the event’s last day in the End Date section.
Turn on Include end date in calculation.
Click Calculate Duration to view the results.
Example: How many days did the 2023 FIFA World Cup last.
2. Determine How Old You Were in a Specific Past Year
This feature helps you check your age in any given year:
Enter your date of birth in the Start Date.
In the End Date, enter the specific year you want to check.
Click Calculate Duration.
3. Get Your Exact Age in Hours, Minutes, and Seconds
If you know your birth time, the Time Duration Calculator can show your precise age down to the second.
4. Discover Your Age in Alternative Time Units
Looking for fun milestones—like turning 1 billion seconds old?
The Special Age Calculator can tell you when you reach a specific time-based milestone.
Enter your date of birth (and time if available).
Choose from the Calculate and Frequency dropdown options.
Click Calculate Alternative Birthdays.
Example: How many minutes you have lived since birth.
5. Identify the Day of the Week for Any Date
If you want to know what weekday a certain date falls on, use the Weekday Calculator.
For seeing weekday information for many dates at once, or viewing everything in calendar form:
Open the Calendar Creator.
Enter the year you want.
Select a country (or leave it unchanged).
Click Create Calendar to generate the year’s full calendar.