Between two dates
Select dates and hit
Calculate
Calculate the difference between two dates, or add and subtract time from any date.
Select dates and hit
Calculate
Our free date calculator has two modes: calculate the exact difference between two dates in years, months, weeks and days, or add and subtract years, months and days from any date to find a future or past date. It's useful for calculating deadlines, project timelines, contract periods, pregnancy due dates, and any date-based planning.
Date differences are calculated by finding the exact number of years, months and days between two dates, accounting for varying month lengths and leap years. The add/subtract mode shifts a date forward or backward by a specified number of years, months and days, correctly handling month-end edge cases.
To find the number of days between two dates, subtract the earlier date from the later date. Our calculator does this instantly and also shows the result in weeks, months and years simultaneously.
Enter your start date in the add/subtract mode, then add the number of days, weeks or months until the deadline. The calculator will show you the exact date the deadline falls on, including the day of the week.
Our calculator shows total calendar days. To estimate working days, subtract approximately 2/7 of the total days (for weekends). For exact working day counts excluding bank holidays, you'd need a dedicated business day calculator.
Use our Age Calculator — enter the date of birth and today's date and it will calculate the exact age in years, months and days. Alternatively, enter both dates in the date difference calculator.
Use the add/subtract mode, enter today's date, and add 90 days. The calculator will show you the exact date 90 days from now, which is useful for contract periods and payment terms.
Add 280 days (40 weeks) to the first day of your last menstrual period. Enter that date in our add/subtract calculator and add 280 days to get your estimated due date.