How to Calculate Date Differences in JavaScript And Add / Subtract Days From a Date With Source Code @1BestCsharpblog
How to Calculate Date Differences in JavaScript And Add / Subtract Days From a Date With Source Code  @1BestCsharpblog
Uploaded May 2025 | Updated September 2026, 2 weeks ago
JavaScript Date Calculations: Adding, Subtracting, and Finding the Difference

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In this JavaScript tutorial, we will see how to create a date calculator that allows users to input two dates and calculate the difference between them in days.
Also It provides an interface for adding or subtracting days from the start date and then calculating the date difference.

What We Will Use:
- HTML5.
- CSS3.
- JavaScript.

----------------------------------- TABLE OF CONTENT -----------------------------------

▶ 00:00 The Final Result Overview
▶ 00:50 Create The Web Page
▶ 06:30 Add Style To Web Page
▶ 19:50 Select the input elements we need to use
▶ 22:40 Create a Function to format the date in YYYY-MM-DD format
▶ 26:45 Set Click Event Listener to the Add Days Button
▶ 34:40 Set Click Event Listener to the Substract Days Button
▶ 36:35 Set Click Event Listener to the Calculate Button

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How to Calculate Date Differences in JavaScript And Add / Subtract Days From a Date With Source Code

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