《晋书·志·第十一章》
到咸宁二年秋天闰九月，派遣使者为汝南王司马柬加冠，说明不一定在正月。
及咸宁二年秋闰九月，遣使冠汝南王柬，此则非必岁首。
In the autumn of the second year of Xianning, the emperor sent an envoy to crown Sima Jian, the king of Runan, indicating that it was not necessarily in January.