《宋书·本纪·卷八》
八日，立皇子昱为皇太子。
戊寅，立皇子昱为皇太子。
On 8th, the Crown Prince named his son Yu as the prince.
<s>[INST] Convert the following English text into Classical Chinese: On 8th, the Crown Prince named his son Yu as the prince. [/INST] 戊寅，立皇子昱为皇太子。</s>
Convert the following English text into Classical Chinese: On 8th, the Crown Prince named his son Yu as the prince.
user
戊寅，立皇子昱为皇太子。
assistant