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Calctive

Date Calculator

Calculate date differences, add or subtract time periods, and analyze date ranges with our comprehensive date calculator. Perfect for planning, scheduling, and date arithmetic.

Input Values

💡Quick Tips

  • •Business days exclude weekends (Saturday and Sunday)
  • •Use Add/Subtract mode for calculating future or past dates from a specific date
  • •Date Difference mode automatically handles which date is earlier or later

Results

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Enter values and calculate

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How to Use

  1. 1Choose between Add/Subtract Duration or Date Difference mode
  2. 2For Add/Subtract: Enter a start date and specify years, months, or days to add or subtract
  3. 3For Date Difference: Enter two dates to see the time period between them
  4. 4Click Calculate to see detailed results including total days, weeks, months, and years
  5. 5View business days count and percentage of year for planning purposes
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Formula

Date Arithmetic: Add/Subtract: End Date = Start Date ± (Years, Months, Days)  Date Difference: Total Days = |End Date - Start Date| / (24 hours) Total Weeks = Total Days / 7 Total Months = Years × 12 + Months Percentage of Year = (Total Days / 365.25) × 100
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Common Use Cases

Calculate project deadline by adding 90 days to start date
Find age in years, months, and days from birthdate
Determine business days between two project milestones
Calculate how many weeks until a future event