Gregorian-Lunar Calendar Converter

Switch Between Gregorian and Lunar Calendars

Whether you're planning a trip around Lunar New Year, tracing family history, or syncing cultural holidays, flipping between Gregorian and East Asian lunar dates can get confusing fast. This calendar conversion tool was built to simplify that. It helps you translate dates between systems like the Chinese, Korean, Vietnamese, or Japanese lunar calendars—all without the need for charts, apps, or manual calculations.

What This Converter Actually Does

At its core, this tool takes a date in either the Gregorian or a lunar calendar and converts it to the other system. You can go in both directions:

• Gregorian to Lunar: Enter a standard calendar date and see its equivalent in your chosen lunar system.
• Lunar to Gregorian: Input a year, month, and day from a lunar calendar and get the corresponding Gregorian date.

It doesn’t stop at just the raw date. You’ll also get helpful extras like the zodiac animal for the lunar year, the type of lunar year (regular or leap), and the length of the lunar month.

Why You Might Need This

If you're working with East Asian cultural calendars—whether for personal traditions, academic work, or just curiosity—this tool saves you from guesstimates and inconsistent online answers. It comes in handy for:

• Finding the Gregorian date for Lunar New Year celebrations
• Identifying someone’s zodiac year based on their birthdate
• Syncing holiday plans across international families
• Translating dates from historical records

Step-by-Step: How to Use the Converter

Pick Your Direction

Start by choosing whether you want to convert from Gregorian to Lunar or vice versa. You’ll find this option in the “Calendar System” section with two radio buttons. Whichever one you select determines which inputs appear next.

Input Your Date

For a Gregorian to Lunar conversion, use the calendar picker and select your time zone. The tool auto-fills today’s date, but you can change it anytime. For Lunar to Gregorian, you’ll manually enter the year, month, and day using number fields. Make sure the numbers are within range—years between 1900 and 2100, months between 1 and 13, and days between 1 and 30.

Select a Lunar System

Choose between Chinese, Korean, Vietnamese, or Japanese lunar calendars. While they share the same astronomical base, the cultural details (like zodiac animals or festival dates) may differ. For example, the Vietnamese calendar includes the Cat instead of the Rabbit in its zodiac cycle.

Click “Convert Calendar”

Once everything is set, hit the “Convert Calendar” button. The result shows both the converted date and a few key details like:

• Calendar System Name (e.g., Korean Lunar Calendar)
• Zodiac Animal (e.g., Year of the Snake)
• Lunar Year Type (Regular or Leap Year)
• Month Length (29 or 30 days)

Extra Details You Might Appreciate

Real-Time Clock and Format Toggle

A live clock at the bottom shows your current time. You can switch between 12-hour and 24-hour formats with a single click, and the display updates instantly.

Timezone Awareness

The Gregorian date picker works alongside a timezone selector. While the conversion logic is based on simplified lunar math, the timezone option helps contextualize your input date if you're referencing international schedules or cultural calendars.

Visual Feedback

After every conversion, the result section slightly scales and changes color to highlight the update. It’s subtle but makes it easy to spot changes after each conversion.

Helpful Auto-Syncing

When you change the Gregorian date, the lunar fields auto-update with approximate values. Similarly, updating the lunar fields will auto-fill the Gregorian input with a rough match. This keeps the forms in sync and helps avoid accidental mismatches.

Questions That Come Up (And What to Do)

Why does the result seem a little off?

This tool uses a simplified model of lunar calendars for demonstration. That means it may not be precise down to the minute, especially for complex leap month calculations. Still, it gives a solid general result for planning and reference.

What if my lunar date has a leap month?

Leap months happen every few years to keep lunar calendars in sync with the solar year. Right now, the calculator handles regular month inputs but doesn’t label leap months specifically. If your month is a leap version (like the second 5th month), just make a note separately.

What if the fields reset when I change something?

That’s by design. Any input change clears the previous result to avoid confusion. Just click “Convert Calendar” again when you're ready.

Keep Traditions and Schedules in Sync With Just a Few Clicks

Instead of flipping through almanacs or opening five tabs to figure out lunar dates, you’ve now got one tool that handles it in seconds. Whether you're keeping up with cultural holidays, marking birthdays, or just curious about what a date means in another system, this calendar converter gives you the answer without the extra effort.