Enforcement Rules of the Patent Act Article 56

The period of six (6) months prescribed under Paragraph 2, Article 142 of the Act is calculated from the day following the filing date of the first patent application in a country which reciprocally recognizes ROC-based priority claims or a member of the WTO to the filing date prescribed under Paragraph 2, Article 125 of the Act.
中文原文 專利法施行細則第56條
本法第一百四十二條第二項所定之六個月,自在與中華民國相互承認優先權之國家或世界貿易組織會員第一次申請日之次日起算至本法第一百二十五條第二項規定之申請日止。

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