Date Calculator
Age calculation, D-Day countdown, and date difference calculation all in one place
International Age
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International Standard Age
Korean Age
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Korean Traditional Age
Year Age
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Current Year - Birth Year
Days Lived
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Weeks Lived
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Months Lived
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Until Next Birthday
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Zodiac Sign
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Chinese Zodiac
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Today0%
Live Countdown
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Days
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Hours
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Minutes
0
Seconds
Weeks
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Months
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Hours
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Minutes
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Difference Between Two Dates
Days
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Weeks
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Months
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Years
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Business Days (Excluding Weekends)
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Weekend Days
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Detailed Difference
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Add/Subtract Dates
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What is a Date Calculator?
A date calculator is a free online tool that provides various date-related calculations such as age calculation, D-Day countdown, and the difference between two dates. You can check international age, Korean age, and year age at a glance, along with zodiac sign and Chinese zodiac information. All calculations are processed in the browser and no data is sent to any server.
Key Features
- Age Calculator: Simultaneously calculates international age, Korean age, and year age, and provides days lived, zodiac sign, and Chinese zodiac information.
- D-Day Calculator: Calculates the remaining days until a target date and displays a live countdown.
- Date Difference: Calculates the difference between two dates in days, weeks, months, and years, and also shows business days.
- Add/Subtract Dates: Adds or subtracts days, weeks, months, or years from a specific date to show the resulting date.
Frequently Asked Questions
International age is the global standard, where one year is added after each birthday. Korean age is the traditional Korean method, where you are 1 year old at birth and gain a year every January 1st. Year age is simply the current year minus the birth year. Since June 2023, South Korea has officially adopted international age.
D-Day (D-0) refers to the target date itself. Days before the target date are shown as D-number (e.g., D-30), and days after are shown as D+number (e.g., D+10). The live countdown is only displayed for future dates.
Currently, business day calculations only exclude weekends (Saturday and Sunday). National holidays are not included, so please use it as a reference. For accurate business day calculations, you should additionally consider the public holidays of the relevant country.
No. All calculations are processed in the browser using JavaScript, and the entered date information is not sent to any server. You can use it with confidence.