Date Duration Calculator
Calculate the exact number of days, weeks, and months between any two calendar dates with or without including the end date.
Date Subtraction Widget
Calculation Result
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About Date Duration Calculator
The Date Duration Calculator measures the distance between two calendar dates. It determines the difference in terms of years, months, weeks, and days. It is built to resolve billing cycles, project timelines, and vacation countdowns.
Note on inclusive dates: Checking the 'include end date' option adds exactly one day to the calculations, representing the full duration including both the starting day and ending day of the period.
Frequently Asked Questions
Q: How do you count the number of days between two dates?
The calculator takes the two dates, converts them into millisecond values since the epoch, subtracts them to find the difference, and divides by 86,400,000 (milliseconds in a day).
Q: Does this date calculator take leap years into account?
Yes, the standard JavaScript Date objects handle leap years and changes in month lengths (28, 29, 30, or 31 days) automatically.