Enforcement Rules of the Government Procurement Act Article 49-1

The date of tender opening specified in the tender documentation for open tendering, selective tendering and price competition under limited tendering procedures shall be the expiry date of the time-limit or the business day following that date. This provision does not apply to the tender opening in the second or the subsequent steps provided that it is a multi-step opening of tenders.
中文原文 政府採購法施行細則第49-1條
公開招標、選擇性招標及限制性招標之比價,其招標文件所標示之開標時間,為等標期屆滿當日或次一上班日。
但採分段開標者,其第二段以後之開標,不適用之。

English translation for reference only; the Chinese text prevails. Not legal advice.