Years Between Two Dates Calculator

A year is the time it takes for the Earth to complete one full orbit around the Sun, which equals approximately 365.25 days. To account for that extra quarter-day, we add a leap day (February 29) every four years. This keeps our calendar aligned with the astronomical year.

The calculator counts the number of complete calendar years between the start and end date, then separately tallies the leftover months and days. For example, from January 15, 2000 to March 20, 2024 gives 24 complete years, 2 months, and 5 days.

Yes. Because it works with actual calendar dates rather than fixed-length years, leap years are inherently handled. February 29 is treated as a valid day when it exists, so the total day counts are always accurate.

When you check 'Include end date', one extra day is added to the total. This is useful when you want to count both the start and end dates as full days — for example, if an event runs from the 1st to the 7th and you want to count all 7 days rather than 6.

Set your start date to January 1, 2013 and the end date to today to find out. As of 2025, that's approximately 12 years ago. The exact number of years, months, and days will depend on the specific date you enter.

Absolutely. Enter the person's date of birth as the start date and today's date as the end date. The 'Complete Years' result is their current age, and the remaining months and days tell you how far they are into their next year.

30 months equals 2 years and 6 months, or 2.5 years. You can verify this with the calculator by entering a start date and an end date exactly 30 months apart.

The calculator automatically handles dates entered in any order and always returns a positive result. If the end date is earlier than the start date, it simply calculates the difference in reverse, so you don't need to worry about which date goes where.