JavaScript: Get time differences in days between two dates

JavaScript Datetime: Exercise-46 with Solution

Write a JavaScript function to get time differences in days between two dates.

Test Data:
dt1 = new Date("October 13, 2014 08:11:00");
dt2 = new Date("October 19, 2014 11:13:00");
console.log(diff_days(dt1, dt2));
6

Sample Solution:

JavaScript Code:

// Define a function diff_days that calculates the difference in days between two Date objects dt2 and dt1
function diff_days(dt2, dt1) 
{
  // Calculate the difference in milliseconds between dt2 and dt1
  var diff = (dt2.getTime() - dt1.getTime()) / 1000;
  // Convert the difference to days by dividing it by the number of seconds in a day (86400)
  diff /= (60 * 60 * 24);
  // Return the absolute value of the rounded difference in days
  return Math.abs(Math.round(diff));
}

// Create two Date objects representing November 2, 2014, and November 6, 2014
dt1 = new Date(2014,10,2);
dt2 = new Date(2014,10,6);
// Output the difference in days between the two Date objects
console.log(diff_days(dt1, dt2));

// Create two Date objects representing October 13, 2014, at 08:11:00 and October 19, 2014, at 11:13:00
dt1 = new Date("October 13, 2014 08:11:00");
dt2 = new Date("October 19, 2014 11:13:00");
// Output the difference in days between the two Date objects
console.log(diff_days(dt1, dt2));

Output:

4
6

Explanation:

In the exercise above,

• The "diff_days()" function takes two Date objects, 'dt2' and 'dt1', as parameters.
• Inside the function, it calculates the difference in milliseconds between 'dt2' and 'dt1' using the "getTime()" method.
• It then converts the difference from milliseconds to days by dividing it by the number of milliseconds in a day, which is calculated as (60 60 24).
• The absolute value of the rounded difference is returned as the result.

Flowchart:

Live Demo:

See the Pen JavaScript - Get time differences in days between two dates-date-ex-46 by w3resource (@w3resource) on CodePen.

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