About the Date Difference Calculator

The difference between two dates can be expressed two ways: as a single number of days, or decomposed into whole years, remaining months, and remaining days — the way people describe age or tenure. The decomposition uses calendar borrowing: when the end day is earlier, one month is borrowed from the month count.

Reading the Result

3 years, 5 months, and 1 day means: advance the start date by 3 years, then 5 months, then 1 day to reach the end date exactly. The total-day figure is independent and exact; the two views agree but describe the span differently.