《隋书·帝纪·卷二》
初九，任命工部尚书杨达为纳言。闰十月初十，高祖下令尚书左仆射杨素与众儒生修正阴阳律历错误。
今四海乂安，五戎勿用，理宜弘风训俗，导德齐礼，缀往圣之旧章，兴先王之茂则。
On 29th, he appointed Minister of Public Works Yang Da as Chancellor. On October 10th, Gaozu ordered Minister of the Left Yang Su and other Confucian scholars to revise the errors of Yin-Yang laws and calendars.