Day Counter
Count exact days between two dates or find days until/since any event.
Enter Dates
What is the Day Counter?
The Day Counter calculates the exact number of calendar days between any two specific dates. It is heavily used in legal contracts, project management deadlines, and counting down to major events like weddings or vacations.
How It Works (Algorithm)
To count days accurately across different months and leap years, the calculator transforms both the Start Date and End Date into absolute Julian Days (or Epoch Timestamps). It subtracts the two values, and divides the remaining seconds by 86,400 to yield the exact day count.
$$ \text{Total Days} = \frac{\text{End Timestamp} - \text{Start Timestamp}}{86,400} $$
There are exactly 86,400 seconds in a standard 24-hour day.
How to Use It
Select your starting date from the calendar. Select your ending date. You can choose whether or not to include the end date in the final tally. The calculator will instantly output the total number of days separating the two events.