Date Calculator
Date Difference Result
Difference will appear here
Common Date Calculations
| Description | Days | Weeks |
|---|---|---|
| Days in a Week | 7 | 1 |
| Days in a Month (Avg) | 30.44 | 4.35 |
| Days in a Year (Non-leap) | 365 | 52.14 |
| Days in a Leap Year | 366 | 52.29 |
Calculated Date
New date will appear here
Date Addition Examples
| Operation | Result |
|---|---|
| Today + 7 days | Next week same day |
| Today + 4 weeks | One month later (approx) |
| Jan 1 + 1 year | Jan 1 next year |
| Feb 28 + 1 day (non-leap) | Mar 1 |
Understanding Date Calculations
Date calculations can vary based on different calendar systems and leap year considerations. Here are some key points to remember:
- Leap Years: Years divisible by 4 are leap years, except for century years which must be divisible by 400
- Month Lengths: Months have 28-31 days (April, June, September, November have 30; February has 28 or 29)
- Date Formats: Our calculator uses ISO 8601 format (YYYY-MM-DD)
- Week Calculation: 1 week = 7 days, but months have approximately 4.35 weeks
Date Calculation Tips
Consider these tips for accurate date calculations:
- When adding months, the day may adjust if the target month has fewer days
- Subtracting time works the same as adding negative time
- For business days calculations, remember to exclude weekends and holidays
- Date differences can be calculated in multiple formats (days, weeks, months, years)
- Time zones can affect date calculations - all calculations are in UTC
Common Date Calculations
Some frequently used date calculations:
- 90 days from today: Common for visa processing deadlines
- 6 weeks from a date: Often used in pregnancy calculations
- 18 years from birth: Legal adulthood in many countries
- 10 business days: Common timeframe for document processing
- Countdown to New Year: Popular celebration timer