An appropriate time to do a particular thing is indicated by the word Kaala(time). According to conventional medical science there is a lapse of an interval between two non simultaneous occurrences, that interval is defined as time. Kaala(time) is ‘Bhagavan’ having neither a beginning nor an end. Everything in this universe is constantly undergoing changes. The change from an earlier condition to its succeeding condition is called Kaala(time) or in other words ‘Parinama.’ Ayurveda a holistic science of longetivity describe Kaala(time) as Karana Dravya as it is the cause for the birth and death of all living beings, for the disorders and excellence of the seasons, properties of substances such as taste and potency, the disorders or excellence of strength of Dosha and the body.