Date Calculator
Calculate dates, find differences between dates, and count working days. Perfect for project planning, deadlines, and date calculations.
Date Calculator
Date Calculator Features
Date Addition
Add days, weeks, months, or years to any date
Date Subtraction
Subtract time periods from dates
Date Difference
Calculate time between two dates
Working Days
Count business days excluding weekends
Multiple Formats
Support for various date formats and units
Project Planning
Perfect for deadlines and scheduling
How to Use Our Date Calculator
Step-by-Step Guide
- 1Enter your start date in any common format
- 2Choose to add or subtract time periods
- 3Specify days, weeks, months, or years
- 4Get instant results with accurate calculations
Supported Operations
- Date Addition: Add days, weeks, months, years
- Date Subtraction: Subtract time periods
- Date Difference: Calculate time between dates
- Working Days: Exclude weekends and holidays
- Age Calculation: Calculate age from birth date
When to Use Our Date Calculator
Project Planning
Calculate project timelines, deadlines, and milestone dates for effective project management.
Event Planning
Plan events, calculate lead times, and determine optimal scheduling dates.
Business Operations
Calculate payment due dates, contract periods, and business day calculations.
Personal Life
Track important dates, calculate age, and plan personal milestones.
Financial Planning
Calculate loan terms, investment periods, and financial milestone dates.
Academic Planning
Plan study schedules, calculate semester dates, and track academic deadlines.
Frequently Asked Questions
How do I calculate the difference between two dates?
Simply enter your start date and end date in the calculator. Our tool will automatically calculate the difference in days, weeks, months, and years between the two dates. This is useful for calculating project durations, relationship anniversaries, employment tenure, age differences, time until events, or any situation requiring precise date differences. The calculator handles all calendar complexities including leap years, varying month lengths (28-31 days), and century transitions to provide 100% accurate results.
Can I add or subtract days from a specific date?
Yes! Enter your base date and specify how many days, weeks, months, or years you want to add or subtract. The calculator will show you the resulting date instantly. This is perfect for deadline calculations (90 days from contract signing), scheduling (3 months from today), planning events (6 weeks before wedding), calculating due dates (40 weeks from conception), determining project milestones, or any date arithmetic. You can combine multiple operations (add 2 months, subtract 5 days) for complex calculations.
Does the calculator account for leap years?
Absolutely! Our date calculator automatically handles leap years (every 4 years except century years unless divisible by 400), different month lengths (February 28/29, April/June/September/November 30, others 31), daylight saving time transitions, and all calendar complexities to ensure accurate calculations. Leap year rules are applied correctly: 2024 is a leap year, 2100 is not, 2000 was. This ensures perfect accuracy for any date calculation regardless of timespan.
Can I calculate working days only?
Yes! The calculator can exclude weekends (Saturday/Sunday) and holidays to give you accurate business day calculations for project planning, deadline management, delivery estimates, contract terms, and legal timeframes. This is essential for business contexts where only working days count. You can customize which days count as workdays and exclude public holidays. For example, "30 business days from today" automatically skips weekends and holidays in the calculation for realistic timelines.
Is the date calculator free to use?
Yes! Our date calculator is completely free to use with no registration, hidden fees, or premium features required. You can make unlimited date calculations—thousands per day if needed—without any restrictions. The tool works entirely in your browser with no data sent to servers. Use it for personal planning, business calculations, project management, legal deadlines, or any date-related math. No ads interrupt your calculations, making it fast and efficient.
What date formats are supported?
We support multiple international date formats including MM/DD/YYYY (US format), DD/MM/YYYY (European format), YYYY-MM-DD (ISO 8601 standard), and various other formats with slashes, dashes, or dots as separators. The calculator automatically detects and converts between different formats, so you can enter dates in your preferred style. You can also use month names (January 15, 2024 or 15 January 2024). This flexibility ensures the tool works naturally for users worldwide regardless of regional date conventions.
How do I calculate someone's age or days until their birthday?
Enter their birth date as the start date and today's date (or any specific date) as the end date. The calculator shows their exact age in years, months, and days. To find days until their next birthday, enter today as the start date and their upcoming birthday as the end date. This works for calculating ages for legal purposes, planning birthday parties, determining eligibility requirements (age 18/21/65), or tracking milestones. You can also calculate age on any past or future date.
Can I calculate dates across different time zones?
Yes! The calculator works with dates regardless of time zone. For date-only calculations (days between dates), time zones don't affect results since we're counting full calendar days. If you need to account for specific time zone differences (calculating hours between timezone-specific moments), enter the dates in the respective time zones and the calculator adjusts automatically. This is useful for international project coordination, global event planning, and cross-timezone scheduling.
What are common use cases for date calculations?
Common uses include: calculating project durations and deadlines (start date + 90 days), determining contract end dates (1 year from signing), planning events (6 months from engagement to wedding), calculating payment due dates (net 30/60/90), determining legal deadlines (statute of limitations), tracking relationship anniversaries, calculating pregnancy due dates (40 weeks from conception), planning retirement (years until age 65), scheduling maintenance intervals (every 6 months), and countless business, legal, personal, and professional scenarios requiring precise date arithmetic.
Does the calculator store my date calculations?
No! All date calculations happen entirely in your browser using JavaScript. Your dates, calculations, and results are never sent to or stored on our servers. Your personal dates—birthdays, anniversaries, project timelines, financial deadlines, or any other information—remain completely private on your device. The calculator works offline once loaded and doesn't require an internet connection. Even your browser history doesn't store the dates you enter, ensuring complete privacy for all your date calculations.
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