Home / Date Difference / Years
Years Between Two Dates
Pick two moments — date, time, down to the millisecond — and get the difference in years, plus the exact calendar breakdown and every other unit.
Date difference in years
This calculator measures the span between two precise moments in YYYY-MM-DD HH:MM:SS.mmm form and expresses it in years. Decimal years are based on the average Gregorian year of 365.2425 days, alongside an exact calendar breakdown.
Both inputs accept milliseconds, so it works equally well for long spans (ages, anniversaries, project durations) and short ones (laps, media edits, log intervals). If the "from" moment is later than "to", the dates are swapped automatically. For a simpler day-level answer, try the date calculator.