Date difference
Calculates the difference between two dates in days, weeks, months, years, workdays and quarters. Plus a precise calendar breakdown 'X years Y months Z days'.
Quick examples
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Dates and result
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Breakdown by unit
Enter both dates above.
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About date difference
Calculating the difference between dates seems simple — but the result depends on which unit you use. The same interval is 730 days, 24 months, 2 years, or 104 weeks, and each formulation is correct.
This calculator shows the difference in all units at once — from days to quarters — and separately counts workdays and weekend days. Useful for planning, deadlines, contract durations, or just curiosity.
Days & weeks
Precise730 days = 104 wk. + 2 days
Days are the most precise unit. A week is always 7 days, so conversion is unambiguous. Use days and weeks for short deadlines: sprints, delivery times, countdowns.
Months & years
Approximate1 year 3 mo. 15 days
Months have different lengths (28–31 days), so converting to months is always approximate. The tool counts full calendar months. Useful for age, contract duration, employment tenure.
Workdays
Mon–Fri14 cal. days = 10 workdays
Workdays are Monday–Friday, excluding public holidays. Holidays vary by country and are not counted. Use for estimating task completion timelines.
Quarters
For business6 months = 2 quarters
A quarter is 3 months. Used in financial planning, reporting and business analytics. A quarter doesn't depend on specific month lengths — it's simply one fourth of a year.