Cambodian New Year (Khmer: បុណ្យចូលឆ្នាំថ្មី) or Chaul Chnam Thmey in the Khmer language, literally "Enter Year New", is the name of the Cambodian holiday that celebrates the New Year. The holiday lasts for three days beginning on New Year's day, which usually falls on April 13th or 14th, which is the end of the harvesting season, when farmers enjoy the fruits of their labor before the rainy season begins. Khmer's living abroad may choose to celebrate during a weekend rather than just specifically April 13th through 15th. The Khmer New Year coincides with the traditional solar new year in several parts of India, Myanmar and Thailand.
Cambodians also use Buddhist Era to count the year based on the Buddhist calendar. For 2011, it is 2555 BE (Buddhist Era). In Cambodia, Khmer New Year is the greatest traditional festival, and also it is the greatest national holiday because it is three days of festival and sometimes can be four days. Khmer New Year begins on April 14th depending on the "MohaSangkran," which is the ancient horoscope.
In fact, Khmer New Year originally began on the first day of the first month in lunar calendar, which can be in November or the beginning of December.
In the Angkor Era, the 13th Century, the Khmer King, either “Suriyavaraman II” or “Jayavaraman VII”, was the one who changed the New Year to the fifth month of the lunar calendar, in April by the solar calendar. 95% of Khmer population is farmer, and the period from November through March is the busiest season for Khmer farmers to reap or harvest the crops from the rice fields.
Khmer people can find free time in April because there is no rain, and it is very hot, so Khmer farmers have the time to take vacation after they have worked very hard to gather the rice crops from their rice fields to get their income.
Therefore, April is the right time for Khmer in Cambodia to celebrate New Year. The Khmer New Year festival originated from “Bramhmanism”, a part