He and Isabeau de Villiers witnessed the baptism of Rachel Jùbert on 16 April 1730 at Nederduitsch Gereformeerde Kerk, Drakenstein, de Caep de Goede Hoop Drakenstein I Baptisms, Den 16 April 1730; K: Rachel; V: Pieter Jùbert De Jonge; M: Susanna de Villiers reets overleden; G: Claùde Marais, Elizabeth De Villiers.
http://www.e-family.co.za/ffy/e2681.htm
so at least after 16 April 1730
Signed MOOC8/5-51 on 12 Sept 1729 which is where that date came from - http://databases.tanap.net/mooc/