Introduction
The Days Since Calculator counts the exact number of days between any two dates. Pick a past date, and it tells you how many days have passed since then. You can also switch to Days Until mode to find out how many days are left before a future date. It works for birthdays, holidays, deadlines, historical events, or any date you care about.
This tool breaks your result down into weeks, months, and years so you can see the full picture. Turn on Business Days Only to skip weekends in the count. You also get a step-by-step solution that shows exactly how the math works. Just enter your dates and hit Calculate to see your answer.
How to Use Our Days Since Calculator
Enter two dates below to find out how many days have passed between them or how many days remain until a future date. The calculator will show you a full breakdown in days, weeks, months, and years.
Calculation Mode: Pick "Days Since" to count how many days have passed since a past date. Pick "Days Until" to count how many days are left until a future date.
Start Date: Enter the earlier date you want to count from. For example, a birthday, a holiday, or any date in the past.
End Date: Enter the later date you want to count to. You can click the "Today" button to quickly set this to today's date.
Business Days Only: Turn this on if you only want to count weekdays. This removes all Saturdays and Sundays from the total.
Creative Mode: Turn this on to see your result written out as a full sentence with extra detail.
Click Calculate to see your results. Click Reset to clear everything and start over.
What Does "Days Since" Mean?
"Days since" is simply the number of days that have passed between a past date and today. For example, if your birthday was 30 days ago, then it has been 30 days since your birthday. You can also count days until a future date, like a holiday or a big event. This is sometimes called a day count or date difference.
How to Count Days Between Two Dates
To find the number of days between two dates, you start at the earlier date and count each day until you reach the later date. This sounds easy for short gaps, but it gets tricky with longer time spans. Months have different lengths: some have 28, 29, 30, or 31 days. Leap years add an extra day to February every four years. That is why people use a calculator instead of counting by hand.
Calendar Days vs. Business Days
Calendar days include every single day: weekdays, weekends, and holidays. Business days (also called working days) only count Monday through Friday. Weekends are skipped. Business day counts are useful for shipping estimates, work deadlines, and legal timelines. A span of 14 calendar days, for example, is only 10 business days. Our Business Days Calculator lets you add or subtract a set number of business days from any date, which is handy for figuring out delivery windows or contract deadlines.
Common Reasons to Count Days
People count days between dates for many reasons. Some popular ones include:
- Tracking milestones, like how many days since you started a new habit, job, or relationship.
- Counting down: finding how many days are left until a vacation, graduation, or due date.
- Project planning: figuring out how many working days you have to finish a task.
- Personal records: knowing how long it has been since an important life event.
Understanding the Results
A day count can be shown in different units. For instance, 365 days is also about 52 weeks, 12 months, or 1 year. Larger numbers can also be broken down into years, months, weeks, and remaining days for a clearer picture. Keep in mind that month and year conversions are approximations because months and years are not all the same length. If you want to count in whole weeks specifically, the Weeks Calculator lets you convert between weeks and days quickly.