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Date Calculator

Calculate the difference between two dates or add/subtract days, weeks, months, and years from a date. See total days, business days, and weekends.

Calculation Type

Time Between Dates

30 days
30
Total Days
4
Total Weeks
23
Business Days

Detailed Breakdown

Total Days30
Total Weeks4 weeks, 2 days
Business Days23
Weekend Days7
Total Hours720
Total Minutes43,200

Quick Reference

EventDateDays Away
End of this monthDec 31, 202522 days
End of this yearDec 31, 202522 days
30 days from nowJan 8, 202630 days
90 days from nowMar 9, 202690 days
6 months from nowJun 9, 2026182 days
1 year from nowDec 9, 2026365 days

Date Calculation Tips

Business Days

Business days exclude weekends (Saturday and Sunday). This is useful for calculating shipping times, project deadlines, and payment terms like "Net 30 business days."

Financial Deadlines

Tax deadline: April 15. IRA contribution deadline: April 15 for prior year. 401(k) contributions: December 31. HSA contributions: April 15 for prior year.

Common Time Periods

  • 1 quarter = ~91 days
  • 1 year = 365 days (366 leap)
  • 1 month = ~30.4 days average

Frequently Asked Questions

What are business days?

Business days are Monday through Friday, excluding weekends. They're used for:

  • Shipping and delivery estimates
  • Payment terms (Net 30, etc.)
  • Project deadlines
  • Legal and financial deadlines

Quick time references

1 week7 days
1 month~30.4 days (average)
1 quarter~91 days
1 year365 days (366 leap year)
1 decade3,652-3,653 days

Important financial dates

  • April 15: Tax filing deadline, IRA contribution deadline
  • October 15: Extended tax filing deadline
  • December 31: 401(k) contribution deadline
  • January 1: New contribution limits take effect

Leap years

Leap years have 366 days (February 29). A year is a leap year if:

  • Divisible by 4, AND
  • NOT divisible by 100, UNLESS
  • Also divisible by 400

2024, 2028, 2032 are leap years. 2100 is not.

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