The Buddhist Calendar is a traditional calendar used in many countries influenced by Buddhism, such as Thailand, Myanmar, and Sri Lanka. It is primarily a lunisolar calendar, meaning it is based on both the phases of the moon and the solar year. The calendar typically consists of 12 months, with an extra month added every few years to keep it aligned with the solar year. The year in the Buddhist Calendar is often counted from the death of Gautama Buddha, which is believed to have occurred around 543 BCE. Different countries may have variations in their calendars, but they generally share similar months and festivals, such as Vesak, which celebrates the birth, enlightenment, and death of the Buddha.