According to Jainism, there is no fixed start date for life on Earth. Time is cyclic and beginningless (anadi-ananta). The universe is eternal, and living beings (jivas) have always existed in various forms across different realms. Each cosmic cycle (kalpa) has two half-cycles with six ages each, but there is no first moment when life began. This is true for both Digambar and Shwetambar traditions, though details about specific ages or beings may vary in texts.

In short: life on Earth did not have a definite beginning in Jain thought; it is part of an endless cycle of time.

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