Difference is computed by normalizing both dates to the same calendar base and taking the difference. Days are counted by calendar day (Gregorian). Weeks = days / 7 rounded down. Years/months/days uses a calendar-walking approach, so a month is the actual number of days in that month (February 29 is handled for leap years).
Date Difference Calculator
Enter any two dates and get the gap in days, in weeks + days, and in years / months / days. Useful for anniversaries, project deadlines, tenures, countdowns and more.