How to Use a Date Calculator

A date calculator is a simple tool that allows you to add or subtract days from a specific starting date to determine a new date. This is especially useful for planning deadlines, trips, contracts, or understanding durations between dates.

What the Date Calculator Does

This online calculator helps you:

• Add a number of days to a given date
• Subtract days by entering a negative number
• Instantly see the result formatted in a clear, readable format

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Step-by-Step Guide to Using the Date Calculator

1. Enter the Start Date

Click on the calendar icon in the “Start Date” field or type in a date manually in the format YYYY-MM-DD.

2. Enter the Number of Days

In the “Add/Subtract Days” field:

• Type a positive number to move forward in time
• Type a negative number to move backward in time
• Example: Entering 30 will give you the date 30 days after your start date. Entering -15 will show the date 15 days earlier.

3. Click “Calculate”

Hit the blue “Calculate” button. The result will appear below, showing the new date.

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Example

Let’s say you:

• Select March 1, 2025, as your start date
• Enter 60 in the “Add/Subtract Days” field

The calculator will return:
“New Date: April 30, 2025”

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FAQ: Date Calculator

Q1: Can I subtract days instead of adding?
Yes! Simply enter a negative number in the “Add/Subtract Days” box (e.g., -10).

Q2: What format does the new date appear in?
The result is shown in your local date format with day, month, and year, like “January 15, 2026”.

Q3: Can I use this to calculate business days?
No, this calculator currently counts calendar days only, not business days (excludes weekends/holidays).

Q4: Will it work on mobile?
Yes. The calculator is fully responsive and works on phones, tablets, and desktops.