Chillai Kalan, the harshest winter periods of 40 days, begins with Winter Solstice every year.
Winter solstice 2021 in Jammu and Kashmir is at 9:29 p.m. Tuesday 21 December.
Winter solstice is the day with the shortest period of daylight and longest night of the year.
Tonight will be the first night of Chillai Kalan.