The lunar calendar is based on the moon's cycles.

Most of the world uses the Gregorian, or Western, calendar, which is based on the time it takes for the Earth to revolve around the sun. In this system, every year has 12 months, each lasting 30 or 31 days with the exception of February. Because it takes 365 days, 5 hours, 48 minutes and 46 seconds for the Earth to revolve around the sun, every fourth year – or leap year – has an extra day. The Chinese use a lunar calendar based on the cycle between new moons, which takes 29.53 days, on average. Each of the 12 months in a lunar calendar lasts one lunar cycle.

Using the Chinese Zodiac or Hong Kong Observatory Converter

Access the Chinese Zodiac or Hong Kong Observatory converter to see a list of years from 1901 to 2100. Both converters are listed in the resources.

Click on the year you're interested in converting. A chart of lunar and Gregorian dates will load.

Locate the numbered lunar month you wish to convert. The lunar months are listed in gray boxes. Scan the chart horizontally to find the specific date you wish to convert.

Look to the left of the lunar date to find the corresponding Gregorian month, in yellow.

Using the Mandarin Tools Converter

Access the Mandarin Tools converter listed in the resources.

Enter the Gregorian day, month and year you wish to convert to lunar. Click the radio button labeled "AD." The converter will only work on dates within the years 1911 to 2050.

Click the button marked "Gregorian Calendar" to convert the date to lunar. The site will return the corresponding lunar date, labeled as "Chinese Date."

Using the Fortune Angel Converter

Access the Fortune Angel converter listed in the resources.

Click the radio button marked "convert solar to lunar" to convert a Western date to a lunar date. Click "convert lunar to solar" to convert a lunar date to Western.

Open the drop-down menu next to "Time Zone" to select your time zone from a list.

Enter your city's longitude in the text box. This is an optional step for more accurate results.

Select the lunar or solar year, month and day you wish to convert using the labeled drop-down menus. Press the "submit" button to perform the conversion.