Date Calculator
Calculate the difference between two dates in various units
This calculator finds the time difference between two dates and displays the result in days, weeks, months, and years.
About this Tool
The date calculator computes the time difference between two dates and displays the result in multiple units including days, weeks, months, and years. This versatile tool helps with project planning, age calculations, contract durations, event countdowns, and historical analysis. Whether you're calculating how many days until a deadline, how long since a milestone, or the duration of a project, this calculator provides instant, accurate results accounting for all calendar complexities including varying month lengths and leap years.
Common Use Cases
Project Management
Calculate project durations, track milestone deadlines, estimate completion dates, and manage timeline planning for complex projects.
Personal Events
Count days until weddings, vacations, birthdays, anniversaries, or other important life events. Perfect for event planning and countdowns.
Legal & Contracts
Determine contract durations, lease periods, warranty expiration, statute of limitations, and other legally significant time periods.
Historical Analysis
Calculate time elapsed between historical events, analyze trends over specific periods, or understand the time span of significant occurrences.
Pro Tips
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Inclusive vs Exclusive Dates
This calculator measures the time between dates. If you need to include both start and end dates in your count, add 1 to the days result.
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Business Days vs Calendar Days
This calculator shows calendar days. For business days (excluding weekends and holidays), you'll need to subtract non-working days manually.
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Different Date Formats
Dates can be entered in various formats depending on your browser and locale settings. The calculator automatically interprets the dates correctly.
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Planning with Results
Use the multiple unit display to choose the most meaningful representation - weeks for short periods, months for medium terms, years for long durations.