Zhangye (609) — the same event in Book of Sui and Zizhi Tongjian
Book of Sui: He stayed at Zhangye.; Zizhi Tongjian: In 609 (Bingwu day), the emperor arrives at Zhangye.
What each source says
He stayed at Zhangye.
丙午，次張掖
Location: 隋書 卷003 帝紀 大業5年6月
In 609 (Bingwu day), the emperor arrives at Zhangye.
”丙午，至張掖。
Location: 권181 609년 항
Place: 張掖
Show on the map — open Book of Sui (Suishu), Imperial Annals