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D-Day / Date Calculator

Calculate anniversaries, D-Day, and exact age.

D-Day Calculator
January 2026
Age Calculator
January 2006
Date Difference Calculator
January 2026
January 2026

Complete Guide to Date Calculation

What is a Date Calculator?

A date calculator is a tool that performs various date calculations in one place: D-Day, date differences, and age. Useful for anniversary countdowns, age calculation, and project period planning.

How to Use

D-Day: Select a target date to calculate days remaining from today. Age: Select date of birth to calculate current age and Korean age. Date Difference: Select two dates to calculate the period between them.

Key Features

• D-Day calculation (past/future supported) • Age and Korean age calculation • Accurate date difference calculation (year/month/day) • Continuous date calculation support

Frequently Asked Questions (FAQ)

Q. Is date calculation accurate?
A. Yes, it provides accurate date calculations including leap years using the date-fns library.
Q. Can I use this on mobile?
A. Yes, it's designed to be responsive and works on all devices.
Date Calculator - Free D-Day & Age Calculation Tool | All-in-One Toolbox