Date Calculator
Calculate date differences, add/subtract days, and determine age instantly
Quick Examples
What is a Date Calculator?
A date calculator is a versatile tool that helps you perform various date-related calculations instantly. Whether you need to find the difference between two dates, calculate a future or past date by adding or subtracting days, or determine someone's exact age, a date calculator simplifies these tasks with precision.
Our date calculator handles all common date calculations including finding the number of days, weeks, months, and years between dates, calculating business days, determining age in years/months/days, and projecting future or past dates based on a given number of days.
Common Use Cases
Project Planning
Calculate project timelines, deadline dates, and duration between milestones for effective project management.
Financial Planning
Calculate loan terms, investment periods, payment due dates, and track financial milestones accurately.
Personal Events
Track anniversaries, calculate exact ages, count down to special occasions, or find how long until retirement.
Legal & HR
Calculate notice periods, contract durations, employee tenure, compliance deadlines, and statute of limitations.
Calculator Features Explained
Date Difference Calculator
Calculate the exact difference between two dates in multiple formats. Get results in years, months, days, total days, weeks, and hours. Perfect for tracking project duration, calculating age differences, or measuring any time period with precision.
Add/Subtract Days
Find what date it will be (or was) after adding or subtracting a specific number of days from any starting date. Useful for calculating deadlines, due dates, expiration dates, or any future/past date scenario.
Age Calculator
Calculate your exact age or anyone's age in years, months, and days. Also shows when the next birthday will be and how many days remain until that special day. Perfect for birthday planning or official age verification needs.
Frequently Asked Questions
How accurate is this date calculator?
This date calculator is 100% accurate. It uses JavaScript's built-in Date object which correctly handles all calendar complexities including leap years, different month lengths, and timezone considerations.
Does it account for leap years?
Yes! The calculator automatically accounts for leap years (February 29th) and all variations in month lengths (28, 29, 30, or 31 days) to provide accurate calculations.
Is my data private and secure?
Absolutely! All calculations are performed entirely in your browser using client-side JavaScript. No dates or personal information are ever sent to any server or stored anywhere. Your privacy is completely protected.
Can I calculate business days only?
Currently, this calculator works with calendar days. For business day calculations (excluding weekends and holidays), you would need to manually account for non-working days. This is a useful feature we're considering for future updates!
What date format does it use?
The calculator uses your browser's date picker which automatically adapts to your locale and preferences. Results are displayed in a readable format (e.g., "November 14, 2025") for clarity.