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Hazuu Tools

Date Calculator

Calculate date differences, add or subtract time from dates, and find the day of the week for any date.

eventDate Calculator
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Calculate Date Difference

Start Date
End Date
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About Date Calculator

The Date Calculator is a versatile tool for working with dates. Whether you need to find the exact number of days between two dates, add or subtract time from a specific date, or simply determine what day of the week a date falls on, this tool handles it all with ease.

All calculations are performed entirely in your browser using JavaScript's built-in Date API. No data is sent to any server, so your information stays completely private. The tool works offline once loaded and delivers instant results.

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How to Use

01

Choose a Mode

Select one of the three tabs: Date Difference, Add/Subtract Time, or Find Weekday.

02

Enter Your Dates

Input the dates and values for your calculation using the date pickers and number fields.

03

Get Instant Results

Click the calculate button to see your results immediately, including detailed summaries.

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Frequently Asked Questions

What is a Date Calculator? expand_more
A Date Calculator is a tool that performs various date-related computations. It can find the difference between two dates, add or subtract days, months, and years from a date, or determine what day of the week any date falls on.
How do I calculate the difference between two dates? expand_more
Select the "Date Difference" tab, enter a start date and an end date, then click "Calculate Difference." The tool will show you the total days, weeks, and approximate months and years between the two dates.
Can I add or subtract time from a date? expand_more
Yes. Select the "Add/Subtract Time" tab, enter a start date, choose whether to add or subtract, enter the number of years, months, and days, then click "Calculate New Date" to see the result.
How do I find what day of the week a date falls on? expand_more
Select the "Find Weekday" tab, enter any date, and click "Find Weekday." The tool will display the day name (e.g., Monday, Tuesday) for that date.
Is my data private? expand_more
Yes. All calculations are performed locally in your browser. No data is sent to any server, and the tool works fully offline once loaded.