Date Difference Calculator
Calculate days between dates or add/subtract days from a date.
Difference between dates
814 Days
116
Weeks
26
Months (approx)
2.23
Years (approx)
About Date Calculations
Days between dates
The number of days between two dates is calculated by converting both dates to their Unix timestamp (milliseconds since Jan 1, 1970), subtracting, and dividing by 86,400,000 (ms in a day). Leap years and month-length differences are handled automatically.
Add and subtract dates
Adding 30 days to Jan 15 = Feb 14 (not always Feb 15)
Months have different lengths — use this calculator for precision
Adding 1 month to Jan 31 = Feb 28 (or 29 in leap year)
Use for rent due dates, notice periods, subscription renewals
Useful date calculations
Notice period: employer must give 30/90/180 days as per contract
Statute of limitations for civil cases: typically 3 years from incident
Cheque validity: 3 months from date of issue
Passport validity: many countries require 6 months beyond travel date
🔒 All calculations happen in your browser — no data is sent to any server. Results are for informational purposes only.