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# Finding Number of Days Between Two Dates JavaScript

We are required to write a JavaScript function that takes in two dates in the 'YYYY-MM-DD' format as the first and second argument respectively. The function should then calculate and return the number of days between the two dates.

For example −

If the input dates are −

const str1 = '2020-05-21'; const str2 = '2020-05-25';

Then the output should be −

const output = 4;

## Example

const str2 = '2020-05-25'; const daysBetweenDates = (str1, str2) => { const leapYears = (year, month) => { if (month <= 2){ --year; }; let floor = Math.floor; return floor(year / 400) + floor(year / 4) - floor(year / 100); }; let monthDays = [0, 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30]; for (let i = 1; i < monthDays.length; ++i){ monthDays[i] += monthDays[i - 1]; }; let days = (year, month, d) => (year * 365) + leapYears(year, month) + monthDays[month] + d; let p = days(...str1.split('-').map(Number)); let q = days(...str2.split('-').map(Number)); return Math.abs(p - q); }; console.log(daysBetweenDates(str1, str2));

## Output

And the output in the console will be −

4

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