Date Calculator

Add or subtract time from dates, calculate differences between dates, and get detailed information including business days, weekends, and holidays.

Base date for calculation

Time to Add

Examples

• Add 3 months and 15 days to today's date
• Calculate days between two birthdays
• Subtract 2 years from a future date
• Find business days between project dates

How to Use the Date Calculator

Our versatile date calculator supports multiple operations for comprehensive date arithmetic:

  1. Choose your operation: Add time, subtract time, or calculate difference
  2. Enter your start date (and end date for difference calculations)
  3. For add/subtract: specify years, months, days, and optionally hours/minutes
  4. Click "Calculate" to get comprehensive results

The calculator provides detailed information including date properties, business days, weekends, holidays, and time breakdowns depending on your selected operation.

Date Calculation Operations

Add Time to Date

Add years, months, days, hours, and minutes to a starting date to find a future date. Useful for scheduling, planning deadlines, or calculating maturity dates.

  • Project completion dates
  • Contract expiration dates
  • Loan maturity calculations
  • Event planning and scheduling

Subtract Time from Date

Subtract time periods from a date to find when something started or to backtrack from a known end date.

  • Project start dates
  • Historical event dating
  • Deadline preparation time
  • Age at specific events

Calculate Date Difference

Find the exact time difference between two dates with comprehensive breakdowns including business days and weekend counts.

  • Project duration analysis
  • Age calculations
  • Employment duration
  • Relationship milestones

Business Days and Workdays

Business day calculations are essential for project management, financial planning, and professional scheduling. Our calculator automatically excludes weekends and provides separate counts for different day types.

Day Type Definitions

  • Business Days: Monday through Friday, excluding holidays
  • Weekdays: Monday through Friday, including holidays
  • Weekends: Saturday and Sunday
  • Total Days: All calendar days including weekends and holidays

Holiday Considerations

The calculator identifies major holidays within date ranges and excludes them from business day counts. This includes federal holidays and commonly observed days off.

Date Information and Properties

Beyond basic calculations, our date calculator provides rich contextual information about dates to help with planning and understanding temporal relationships.

Calendar Properties

  • Day of Week: Monday, Tuesday, etc.
  • Day of Year: 1-365 (or 366 in leap years)
  • Week of Year: ISO week numbering system
  • Quarter: Q1, Q2, Q3, or Q4
  • Season: Spring, Summer, Fall, Winter
  • Leap Year: Whether the year has 366 days

Practical Applications

  • Financial quarter planning
  • Seasonal business adjustments
  • Academic calendar coordination
  • Event planning considerations