Date Tools
Convert calendars by the official rules of each country. Dates are processed in your browser.
Japanese Era Converter
Convert a date between the Western calendar and the Japanese era names Meiji, Taisho, Showa, Heisei and Reiwa, with 元年, the zodiac year and an age chart.
Thai Buddhist Year Converter
Convert dates between the Thai Buddhist Era (พ.ศ.) and the Western calendar (ค.ศ.), including January to March before 1941, when the Thai year still began on 1 April.
Lunar Calendar Converter
Convert dates between the Gregorian calendar and the Korean, Chinese and Vietnamese lunar calendars, which fall on different days in some months, with leap months and the zodiac year.
Choosing the right date tool
The Japanese Era Converter turns a Western date into its Japanese era name and back, from Meiji to Reiwa. It knows the day each era began, so 7 January 1989 is 昭和64年 and 8 January 1989 is 平成元年, and it explains why a date such as 平成31年5月1日 does not exist. It also gives the zodiac year (干支) and an age chart (年齢早見表) for every year of birth since 1912.
The Thai Buddhist Era Converter converts dates between พ.ศ. and the Western calendar. Today the Buddhist year is the Western year plus 543, but until 1940 the Thai year began on 1 April: January to March of those years are only 542 years apart, and B.E. 2483 had nine months. The converter applies these rules to every date from 1 April 1889.
The Lunar Calendar Converter converts dates between the Gregorian calendar and the Korean, Chinese and Vietnamese lunar calendars from 1901 to 2050. The three follow the same rules but count days in different time zones, so a month sometimes starts a day apart: the 2027 new year is 6 February in China and 7 February in Korea, and Vietnamese Tết came a month early in 1985. Korean dates match the Korea Astronomy and Space Science Institute and Chinese dates the Hong Kong Observatory tables; the converter shows leap months, the zodiac year and the same day in the other two calendars.
These tools run in your browser, and the dates you enter are not sent to LeedyBox or saved. Each tool page names the official sources of its rules and the date they were last checked.