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Calctive

Time Calculator

Add or subtract time intervals, calculate time differences between two times, and get detailed duration breakdowns with our comprehensive time calculator.

Input Values

💡Quick Tips

  • •Use Add/Subtract mode to find end time after adding or removing hours
  • •Enable date option for overnight shifts or multi-day calculations
  • •Time Difference mode automatically handles overnight periods

Results

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Enter values and calculate

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How to Use

  1. 1Select your calculation mode: Add/Subtract Time or Time Difference
  2. 2For Add/Subtract: Enter start time and amount to add or subtract
  3. 3For Time Difference: Enter start and end times
  4. 4Enable date option for calculations spanning multiple days
  5. 5Click Calculate to see detailed results
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Formula

Add/Subtract Mode: End Time = Start Time ± (Hours × 3600 + Minutes × 60 + Seconds)  Time Difference Mode: Difference = End Time - Start Time Total Hours = Difference in Seconds / 3600 Percentage of Day = (Difference in Seconds / 86400) × 100
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Common Use Cases

Calculate work hours: 9:00 AM to 5:30 PM
Add 2 hours 30 minutes to current time
Calculate overnight shift duration with date option
Subtract time to find start time from end time