Days Between Two Dates Calculator
Whether you need to count days until an event, calculate a deadline, or find a date in the past, our date calculator handles all your date arithmetic needs.
Calculate Days Between Dates
The date difference calculator counts the total number of days between any two dates. It also breaks down the result into years, months, and days for easier understanding. Useful for:
- Counting down to weddings, vacations, or other events
- Calculating project durations and timelines
- Determining age differences or relationship milestones
- Figuring out how long ago something happened
- Calculating business days for work scheduling
Add or Subtract from Dates
Need to find what date it will be in 90 days? Or what date it was 6 months ago? The add/subtract calculator lets you:
- Calculate due dates and deadlines (30, 60, 90 days out)
- Find payment or billing cycle dates
- Determine contract expiration dates
- Plan future events weeks or months ahead
- Look back to reference past dates
Understanding Business Days
Business days exclude weekends (Saturday and Sunday) and are commonly used in legal, financial, and business contexts. For example, delivery estimates, payment terms, and legal deadlines often specify business days rather than calendar days.
Note that our calculator does not account for public holidays, which vary by country and region. For precise business day calculations, you may need to manually adjust for holidays in your area.
Does the calculator include the start and end dates?
The calculation shows the number of days between the two dates, not including the start date but including the end date. For example, January 1 to January 2 equals 1 day.
How are months calculated when adding/subtracting?
Adding months moves to the same day in a future month. If that day does not exist (like adding one month to January 31), it adjusts to the last valid day of the target month.
Does it account for leap years?
Yes, the calculator correctly handles leap years. February has 29 days in leap years (every 4 years, with exceptions for century years not divisible by 400).
Can I calculate dates in the distant past or future?
Yes, JavaScript date handling supports dates from approximately 271,821 BCE to 275,760 CE. For practical purposes, any date you need to calculate should work fine.