How Can I Accurately Calculate the Difference in Whole Days Between Two Dates in JavaScript?

Calculating Date Differences in JavaScript

As you've mentioned, obtaining the difference between two dates solely in whole days can be challenging. Your initial attempt using getDate() retrieves the day of the month, which may not accurately reflect the full time elapsed.

Solution:

To resolve this, we employ the following approach:

const date1 = new Date('7/11/2010');
const date2 = new Date('12/12/2010');
const diffTime = Math.abs(date2 - date1);
const diffDays = Math.floor(diffTime / (1000 * 60 * 60 * 24));

Explanation:

1. Calculate the time difference: diffTime equals the absolute difference between the two dates in milliseconds.
2. Convert milliseconds to days: We divide diffTime by milliseconds per day, yielding a floating-point number.
3. Extract whole days: Using Math.floor(), we truncate the floating-point number to obtain the number of whole days (diffDays).

This method accurately determines the difference between two dates without including fractions of days.

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