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About Between Dates Calculator Online
This tool computes the exact difference between two dates — in years, months, days, hours, minutes, and seconds. It correctly handles leap years, varying month lengths, and Daylight Saving Time transitions.
Use it to count days until a deadline, measure time between events, compute someone's age at a specific date, or settle bets about how long ago something happened. Unlike subtracting calendar years, this calculator gives day-accurate results.
It also shows the total in different units, so you can answer questions like "How many weeks is 1,300 days?" or "How many hours has it been since launch?" The display makes all the common unit conversions visible in one place.
How to use this tool
How to count days between two dates
Pick the calendar
"Calendar" supports Gregorian (Miladi), Jalali (Persian / Shamsi), and Hijri (Umm al-Qura). Both the start and end dates are interpreted against the SAME calendar — they're then converted internally to Gregorian instants for the math.
Enter start date
Three integer fields: "Start year" (1–2500), "Start month" (1–12), "Start day" (1–31). The picker UI shows the chosen calendar's month names so you can read the date in familiar form.
Enter end date
Same three fields with `end` prefix. End may equal start (zero-day result) or be before start (negative deltas). Leap days and irregular months in each calendar are handled by the conversion layer.
Press Run
Result returns years/months/days difference plus totalDays, totalWeeks, and totalHours. Use it for tenure, sprint length, savings duration, or visa stays — anything driven by a date span.