Date Calculator | Free Days Between Dates & Age Tool
Calculate the exact duration between two dates with a detailed breakdown in years, months, weeks, and days. Add or subtract time from any date. Calculate your exact age in years, months, and days with next birthday countdown and zodiac sign. Includes business day counting and day-of-week display.
📖 Want to understand your results?
Read our complete guide to the Date Calculator — with real-world examples, expert insights, and pro tips.
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Calculator Features
Date Difference
Calculate the number of days between any two dates. Shows a detailed breakdown in years, months, weeks, and days. Displays the start and end days of the week.
Add / Subtract
Add or subtract years, months, weeks, and days from any date. Quick preset buttons for common operations like +30 days, +90 days, or +1 year.
Age Calculator
Calculate exact age in years, months, and days. See your next birthday countdown, zodiac sign, and total age in days, weeks, and months.
Business Days Toggle
Toggle business day counting (Monday-Friday) to see the weekday vs weekend breakdown for any date range.
Granular Breakdown
Every result shows multiple units simultaneously: years, months, weeks, days, and total days. No need to switch between modes.
Day of Week Display
Every result includes the day of the week. Know what day a date falls on, or what day of the week you were born.
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How to Use
Find Days Between Dates
- Select the 'Date Difference' mode tab
- Choose a start date and end date using the date picker
- See the total days, years, months, and weeks breakdown
- Toggle 'Business days' to see weekday vs weekend breakdown
- The day of the week is shown for both dates
Add or Subtract from a Date
- Select the 'Add / Subtract' mode tab
- Choose Add or Subtract
- Enter years, months, weeks, and/or days
- Use quick presets for common operations like '+30 days'
- See the result date with day of week and nearby dates
Calculate Your Age
- Select the 'Age Calculator' mode tab
- Enter your date of birth
- See your exact age in years, months, and days
- Check your next birthday countdown and what day it falls on
- Discover your zodiac sign and age in total days/weeks/months
Reviewed by Emily Watson, M.Ed.
Mathematics EducatorMathematics teacher and curriculum designer with 15+ years of experience.
Date Calculator Pros & Cons
Pros
- ✅ Instant date difference with full breakdown
- ✅ Add/subtract years, months, weeks, or days
- ✅ Includes age calculator with zodiac sign
- ✅ Free forever — no subscriptions
- ✅ Works offline after page load
Cons
- ✗ No recurring event calendar integration
- ✗ No timezone-aware date calculation
Frequently Asked Questions
How do I calculate the number of days between two dates?
Use the 'Date Difference' mode. Select a start date and end date using the date pickers. The calculator shows total days, plus a breakdown in years, months, weeks, and days.
How many days are in a year?
Common years have 365 days. Leap years have 366 days. Leap years occur every 4 years (divisible by 4), except for century years not divisible by 400.
What are business days?
Business days are Monday through Friday, excluding weekends (Saturday and Sunday). Toggle the 'Business days' checkbox in Date Difference mode to see the weekday vs weekend breakdown.
How do I add days to a date?
Select 'Add / Subtract' mode, choose 'Add', then enter the number of days, weeks, months, or years. You can combine multiple units for precise results.
How do I calculate my exact age?
Select 'Age Calculator' mode and enter your date of birth. The calculator shows your exact age in years, months, and days, plus your next birthday countdown and zodiac sign.
How many weeks are in a year?
A standard year has 52 weeks plus 1 day (52 × 7 + 1 = 365 days). A leap year has 52 weeks plus 2 days (52 × 7 + 2 = 366 days).
Want to Learn More?
Check out our comprehensive guide for in-depth explanations, real-world examples, and expert tips.
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