Hours Between Two Dates Calculator



Calculating the hours between two dates is a common requirement in various applications, especially when dealing with time-sensitive tasks. Whether it’s for project management, tracking work hours, or scheduling events, having a reliable hours between two dates calculator can be invaluable. In this article, we’ll provide you with a simple yet accurate HTML and JavaScript code for such a calculator.

How to Use

To use the calculator, enter the start and end dates in the provided input fields. Click the “Calculate” button, and the result will be displayed instantly. The calculator considers both date and time, providing precise calculations for the hours between the specified dates.


The formula used for calculating the hours between two dates is:

This formula ensures accuracy by taking into account the difference in milliseconds between the two dates and converting it to hours.


Suppose we want to find the hours between January 1, 2023, 12:00 PM, and January 2, 2023, 3:30 PM. The calculation would be:


Q: Can I input dates in any format?
A: The calculator accepts dates in the format: “YYYY-MM-DD HH:MM AM/PM”.

Q: Does it account for daylight saving time changes?
A: Yes, the calculator considers daylight saving time changes for accurate calculations.

Q: Can I use it for dates spanning multiple days?
A: Absolutely, the calculator accurately calculates hours spanning across multiple days.


Having a reliable hours between two dates calculator is crucial for various applications. The provided HTML and JavaScript code offers a straightforward solution, ensuring accurate calculations for both date and time inputs. Feel free to integrate this code into your projects for seamless date and time-related calculations.

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