The Khmer calendar is a traditional calendar used in Cambodia, primarily for agricultural and cultural purposes. It is a lunisolar calendar, meaning it is based on both the phases of the moon and the solar year. The calendar consists of 12 months, with an additional month added every few years to align it with the solar year. The Khmer calendar is significant for determining important festivals and religious events, such as the Khmer New Year and the Pchum Ben festival. It plays a crucial role in the daily lives of the Cambodian people, guiding agricultural activities and cultural celebrations throughout the year.