《晋书·志·第八章》
推五行用事日：立春、立夏、立秋、立冬曰，即木、火、金、水开始用事日。
推五行用事日：立春、立夏、立秋、立冬者，即木、火、金、水始用事日也。
Push the five elements to the day of use: the day of the beginning of spring, the beginning of summer, the beginning of autumn, and the beginning of winter mean that the days of wood, fire, gold, and water begin to be used.