Enforcement Law for Part IV, Family Law of the Civil Code Article 6-2

The separate property of or the contributed property owned at the time of getting married by the husband and the wife, who applied the union property regime before the coming into force of the revision in 2002, shall be deemed as the property acquired before marriage after the coming into force of the revision; the contributed property acquired during the continuance of marriage relationship shall be deemed as the property acquired in marriage after the coming into force of the revision.
中文原文 民法親屬編施行法第6-2條
中華民國九十一年民法親屬編修正前適用聯合財產制之夫妻,其特有財產或結婚時之原有財產,於修正施行後視為夫或妻之婚前財產;婚姻關係存續中取得之原有財產,於修正施行後視為夫或妻之婚後財產。

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