Time Calculator
Add or subtract years, months, weeks, and days from any date. Perfect for calculating project deadlines, contract expiration dates, pregnancy due dates, or planning future events with precision.
Time Calculator
How to Use This Calculator
Select your starting date, choose whether to add or subtract time, then enter the number of years, months, weeks, and days. The calculator will compute the resulting date and show you the total difference in days and weeks. All leap years and varying month lengths are handled automatically.
Adding Time to Dates
When adding time to a date, the calculator processes years first, then months, then weeks and days. This ensures accurate results even when dealing with leap years or months with different numbers of days. For example, adding 1 month to January 31st will result in February 28th (or 29th in leap years).
Subtracting Time from Dates
Subtracting time works in reverse, moving backward from your starting date. This is useful for determining when something started based on a known end date, calculating retroactive deadlines, or figuring out historical dates. The calculator handles month-end edge cases intelligently.
Common Use Cases
This calculator is perfect for project planning (add 90 days to today for deadlines), pregnancy calculations (add 40 weeks to conception date), contract management (add 2 years for renewal dates), loan maturity dates, visa expiration calculations, warranty end dates, subscription renewals, and event planning.
Understanding Leap Years
Leap years occur every 4 years, adding an extra day to February (29th instead of 28th). The calculator automatically accounts for leap years when performing date calculations. Years divisible by 4 are leap years, except century years which must be divisible by 400 (2000 was a leap year, 1900 was not).
Frequently Asked Questions
Q: Can I add and subtract at the same time? A: No, choose one operation per calculation. Q: How are months calculated? A: By calendar months, not 30-day periods. Q: What about time zones? A: Dates only, no time zones involved. Q: Can I calculate past dates? A: Yes, works for any date. Q: Are weekends counted? A: Yes, all days are counted.