Time Calculator Online | Date Interval & Duration Tool

Calculate time intervals, date differences, and perform time arithmetic. Add or subtract days, hours, minutes with support for business days.

Date Interval Calculator

Start Date
End Date
Total Days
Working Days
Weeks
Please select start and end dates

Time Arithmetic

Base Date
Years
Months
Weeks
Days
Hours
Minutes
Seconds

Result

Date Time
Timestamp

Instructions and Related Knowledge

Date Interval Calculation

  • Calculate intervals between two dates, including years, months, days, weeks, and working days
  • Option to include or exclude end date, affecting the final calculation
  • Working days calculation excludes Saturdays and Sundays by default
  • Detailed results show specific distribution of years, months, and days

Time Arithmetic

  • Supports addition and subtraction of date/time including years, months, weeks, days, hours, minutes, seconds
  • Negative numbers can be used for backward time calculation
  • Month calculations automatically handle differences in days between months
  • Supports viewing results in timestamp format
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