"When the Brahmins, in the Atiratra rite of Soma, sing like a lake that is full, on that day the year ends; when the frogs become desirous of the commencement of the rains, the Soma-drinking Brahmins raise their voice, accomplishing the year-long rite (VII. 103.7-8).21"
January 1, 1970
https://en.wikiquote.org/wiki/Hindu_calendar