Date Calculator — Tips & Guide
Calculate the exact number of days, weeks, months, and years between any two dates. Handles leap years automatically. Useful for age calculations, project timelines, and event planning.
Calculate Your Age
Set the start date to your birthday and the end date to today to calculate your exact age in years, months, and days — more precise than just knowing your birth year.
Project Deadlines
Set the start date to today and the end date to your project deadline to see exactly how many days (and working days) you have left to complete your work.
Event Countdowns
Calculate how many days until a wedding, vacation, exam, or product launch. Update weekly to track your countdown as the date approaches.
Contract Duration
Calculate the exact duration of employment contracts, rental agreements, or subscriptions by entering the start and end dates to see the total days and months of coverage.
Days Since an Event
Enter a past start date and today as the end date to calculate exactly how many days have passed since a birthday, anniversary, historical date, or project kickoff.
Leap Years Are Automatic
The calculator uses JavaScript's native Date object, which correctly handles leap years, varying month lengths, and daylight saving time for all dates back to 1900.
Select your start date and end date using the dropdowns above, then click Calculate. The result shows the total number of days between the dates, plus a breakdown into years, months, and remaining days, the number of complete weeks, and an estimate of working days (excluding weekends). The calculation is accurate for any two dates from 1900 onwards.
This calculator measures the difference between two dates. To find a date that is a certain number of days in the future, set your start date to today, then adjust the end date until the "Total Days" result matches the number of days you want to add. Alternatively, use a dedicated "add days to date" calculator for this specific task.
A business day calculator counts only working days (Monday–Friday) between two dates, excluding weekends. This calculator provides a workday estimate by multiplying the total weeks by 5 and adding the remaining weekdays. Note that this estimate does not account for public holidays, which vary by country and year. For legally binding contract calculations, verify with a calendar that accounts for specific holidays.
Set the start date to your date of birth and the end date to today's date, then click Calculate. The Years / Months / Days breakdown shows your exact age — for example, "32 years, 4 months, 17 days." This is more precise than simply subtracting birth year from the current year, as it accounts for whether your birthday has occurred yet this year.