Day Counter
Count the number of days between two dates.
Try an example
364 days
About this calculator
What Is a Day Counter?
A day counter tells you how many days there are between two dates — or how many days remain until an event you are waiting for. It is the quick answer to questions like "how many days until my birthday, wedding or vacation?" and "how long has it been since a particular date?" Pick a start and an end, and you get the total number of days, often with a breakdown into weeks, months and years. It is just as useful for deadlines, project planning, subscription trials and countdowns.
How the Count Works
Under the hood, each date is converted to a day number, and the difference between them is the answer. That way, the calculation automatically accounts for months of different lengths and for leap years. One point to decide is whether to include the end date: counting from January 1 to January 10 is 9 days if you count the difference, or 10 days if you include both the first and the last day. Legal and business situations often spell out which convention applies, such as "within 30 days of receipt."
Worked Example
From January 1 to December 31, 2026, there are 364 days between the two dates — or 365 days if the end date is included in the count.
Calendar Days vs. Business Days
Calendar days include every day of the week. Business or working days leave out weekends and, depending on the situation, public holidays. Contracts, shipping estimates and payment terms are frequently expressed in business days, which means the same number of days can end on very different dates. If you need a date that is a certain number of days forward or back, the Date Calculator adds and subtracts days directly.
Everyday Uses
- Countdowns to holidays, trips, due dates and exams.
- Count-ups: days since a milestone, quitting a habit or starting a job.
- Deadlines and notice periods: checking the last day to cancel, return or file.
- Project plans: measuring phases and durations in days.
Handy Facts
A common year has 365 days and a leap year has 366; a week is 7 days, so a 90-day period is 12 weeks and 6 days. For exact ages use the Age Calculator, for hours and minutes the Time Duration Calculator, and for pregnancies the Due Date Calculator.
Worked example
From January 1 to December 31, 2026, there are 364 days between the two dates (365 if the end date itself is included in the count).
Frequently asked questions
Why might the count be off by one from what I expected?
It depends on whether you're counting the span between two dates or the number of calendar days including both endpoints. Use the 'include end date' option to switch between the two.
Can I count days backward from a future date?
Yes — enter the later date as the start and the earlier date as the end; the result reflects a negative span, showing how many days before the start date the end date falls.
How is this different from the Date Calculator?
The Date Calculator adds or subtracts an amount of time from one date to find another. This tool goes the other direction — given two known dates, it counts the days between them.
