Shaka Samvat is a historical calendar system used in India, established by the Indian emperor Shalivahana in 78 CE. It is a lunisolar calendar, meaning it is based on both the moon's phases and the sun's position. The Shaka Samvat is widely used for civil purposes and in Hindu festivals, providing a framework for determining auspicious dates. The calendar consists of 12 months, with each month having either 29 or 30 days. The year begins in the month of Chaitra, which usually falls in March or April. The Shaka Samvat is recognized by the Indian government and is often used alongside the Gregorian calendar for official purposes.