Date Difference Calculator

Date Difference Calculator

Calculate the time between two dates in multiple units. Add or subtract days, find business days, and more.

Select Dates

Quick Presets

Today
Yesterday
Tomorrow
Next Week
Next Month
Next Year
Work Week
Summer Holiday

Calculation Options

Date Difference Results

Your Results Will Appear Here

Select your dates and click "Calculate Difference" to see the time between them in various units.

Date Operations

Perform operations with the selected dates

Add Days
Add specific number of days to a date
Subtract Days
Subtract days from a date
Business Days
Calculate workdays between dates
Day of Week
Find what day a date falls on
Countdown Timer
Live countdown to future date
Age Calculator
Calculate age from birthdate

About Date Calculations

Time Units Explained

Days: Total calendar days between two dates.

Business Days: Weekdays only (Monday-Friday).

Weeks: 7-day periods (remainder shown as days).

Months: Based on average month length (30.44 days).

Years: Based on average year length (365.25 days).

Common Holidays (US)
  • New Year's Day Jan 1
  • Memorial Day Last Mon in May
  • Independence Day Jul 4
  • Labor Day 1st Mon in Sep
  • Thanksgiving 4th Thu in Nov
  • Christmas Day Dec 25
Tips & Notes

• Leap years are automatically accounted for in calculations.

• Time zone differences are not considered in this calculator.

• Business day calculations exclude weekends and selected holidays.

• For precise calculations including time zones, use specialized tools.