Date Difference Calculator
Calculate the exact time between any two dates
Results
Server CalculatedSelect two dates to see the detailed breakdown.
Add or Subtract Days
Find what date it will be after adding or subtracting days
Results
Server CalculatedBusiness Days Calculator
Calculate working days excluding weekends and holidays (with observed date rules)
Results
Server CalculatedHolidays in range:
No holidays found in the selected range.
Age Calculator
Calculate your exact age in multiple time units Live
Your Age
Server CalculatedEnter your birth date to see your exact age.
Due Date Calculator
Calculate pregnancy due date or conception date
Pregnancy Information
Server CalculatedEnter the required information to calculate your pregnancy timeline.
Quick Calculations
Popular date calculations with one click
Frequently Asked Questions
Common questions about date calculations
Use our Date Difference Calculator above. Simply enter your start date and end date, and click "Calculate Difference." The tool will show you the exact number of days, weeks, months, and years between the two dates.
A calendar day includes every day of the week (Monday through Sunday), while a business day typically excludes weekends and public holidays. You can customize which days to exclude in our Business Days Calculator.
When a holiday falls on a weekend, it is observed on the nearest weekday. If a holiday falls on Sunday, it's observed on Monday. If it falls on Saturday, it's observed on Friday. Our calculator automatically applies these rules when you select a country.
The most common method is Naegele's Rule: Add 280 days (40 weeks) to the first day of the last menstrual period (LMP). Our calculator adjusts for different cycle lengths.
Our calculator includes major federal and national holidays for US, UK, and Canada. You can select which country's holidays to exclude or choose no holidays at all. Observed dates are automatically calculated for holidays falling on weekends.