Caixin reported that a research paper from the Southern Medical University Biosafety Level 3 (P3) Lab stated that the novel coronavirus is unlikely to have evolved from RaTG13, the bat coronavirus, which shares the most similar genome. It also suggested that the coronavirus was likely to have started between September 23, 2019 and December 15, 2019.
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Excerpt in Chinese:
科研人员对于新冠病毒起源的探索仍在继续。近日，南方医科大学公共卫生学院三级生物安全实验室的一篇研究论文称，新冠病毒（SARS CoV-2）的出现时间可能在2019年9月23日至2019年12月15日之间。新冠病毒与基因序列最为相似的蝙蝠冠状病毒RaTG13不存在时间进化关系，新冠病毒不太可能由RaTG13演化而来。
Source: Caixin, February 26, 2020
http://science.caixin.com/2020-02-26/101520898.html