Time between Dates Calculator
Calculate the exact time difference between any two dates in seconds, days, years, or any unit you prefer
Calculate Time between Dates
Time Difference Result
Enter both dates to see the time difference
Example Calculations
Example 1: Date Range
From: January 1, 2024
To: December 31, 2024
Result: 365 days (366 in leap year)
Working Days: ~261 days (excluding weekends)
Example 2: Short Period
From: August 1, 2025
To: August 15, 2025
Result: 14 days (15 if end date included)
In Hours: 336 hours
Date Calculation Tips
Same Month
Simply subtract day numbers for dates in the same month
Leap Years
Remember February has 29 days in leap years (every 4 years)
Working Days
Exclude weekends for business day calculations
End Date
Choose whether to include the final date in your count
Time Conversion Reference
1 day = 24 hours = 1,440 minutes = 86,400 seconds
1 week = 7 days
1 month ≈ 30.44 days (average)
1 year = 365.25 days (accounting for leap years)
Working year ≈ 261 days (excluding weekends)
How to Calculate Time between Dates
Manual Calculation Steps
Calculating time between dates manually can be complex, especially for dates spanning multiple months or years. Here's the general approach:
- 1.For same month: subtract day numbers (e.g., Feb 19 - Feb 12 = 7 days)
- 2.Calculate days from start date to end of that month
- 3.Add full months/years between the dates
- 4.Add days from start of end month to end date
- 5.Account for leap years (February has 29 days)
Conversion Formulas
From Days to Other Units
• Hours: days × 24
• Minutes: days × 1,440
• Seconds: days × 86,400
• Weeks: days ÷ 7
• Months: days ÷ 30.44
• Years: days ÷ 365.25
Special Considerations
- • Leap years occur every 4 years (366 days)
- • Month lengths vary (28-31 days)
- • Working days exclude weekends
- • Time zones can affect precise calculations
- • Historical calendar changes (Gregorian calendar)
Common Use Cases
Project Planning
Calculate project durations, deadlines, and milestone spacing.
Age Calculations
Determine exact age in years, months, and days from birth date.
Event Planning
Count down to special events, holidays, or important dates.