The
Buddhist calendar (; , ; , , ) is a set of
lunisolar calendars primarily used in
mainland Southeast Asian countries of
Cambodia,
Laos,
Myanmar and
Thailand as well as in
Sri Lanka for religious and/or official occasions. While the calendars share a common lineage, they also have minor but important variations such as
intercalation schedules, month names and numbering, use of cycles, etc. In Thailand, the name Buddhist Era is a
year numbering system shared by the traditional
Thai lunisolar calendar and by the
Thai solar calendar.