What would you like to calculate?
Start Date
End Date
Time Between Dates
30
Days
4.3
Weeks
0
Months
0
Years
30 days
Quick Reference
1 Week
7 days
2 Weeks
14 days
1 Month
30 days
3 Months
90 days
6 Months
180 days
1 Year
365 days
2 Years
730 days
5 Years
1,825 days
Fun Facts About the Start Date
Save Important Dates
Life Milestones
From the start date, when will these milestones be reached?
Quick Answer
To find days between dates: subtract the earlier date from the later date. Our calculator instantly shows the difference in days, weeks, months, and years. To add days to a date: select start date and enter number of days to add. For business days, exclude weekends and optionally holidays. Example: January 1, 2026 to December 31, 2026 = 364 days = 52 weeks.
Key Facts
- Days between dates = End Date - Start Date
- Average month = 30.44 days; Average year = 365.25 days (accounting for leap years)
- Business days exclude Saturday and Sunday (260 business days per year)
- Leap years have 366 days; occur every 4 years except century years not divisible by 400
- Weeks between dates = Days / 7
- ISO week starts Monday; US week starts Sunday
- Unix timestamp: seconds since January 1, 1970
- Julian date is days since January 1, 4713 BC
Frequently Asked Questions
How do I calculate days between two dates?
Enter both dates and the calculator will show the difference in days, weeks, months, and years. It also calculates workdays (excluding weekends) and weekend days separately.
Does the calculator account for leap years?
Yes! The calculator uses proper date math that accounts for leap years, varying month lengths (28-31 days), and all calendar irregularities. February 29th is included in calculations when applicable.
What counts as a workday?
Workdays are Monday through Friday. The calculator excludes Saturdays and Sundays. Note that public holidays are NOT excluded as they vary by country and region.
How do I calculate a future date?
Switch to "Add Days to Date" mode. Enter a start date and the number of days to add. The calculator will show the resulting date. You can also subtract days to find past dates.
Why does the months calculation differ from simple division?
Months have different lengths (28-31 days), so 30 days doesn't always equal 1 month. The calculator counts actual calendar months, giving more accurate results for date planning.