Earliest-found use of “vulgaris aerae” (Latin for Common Era) (1615). Johannes Kepler (1615). Joannis Keppleri Eclogae chronicae : ex epistolis doctissimorum aliquot virorum & suis mutuis, quibus examinantur tempora nobilissima: 1. Herodis Herodiadumque, 2. baptismi & ministerii Christi annorum non plus 2 1/4, 3. passionis, mortis et resurrectionis Dn. N. Iesu Christi, anno aerae nostrae vulgaris 31. non, ut vulgo 33., 4. belli Iudaici, quo funerata fuit cum Ierosolymis & Templo Synagoga Iudaica, sublatumque Vetus Testamentum. Inter alia & commentarius in locum Epiphanii obscurissimum de cyclo veteri Iudaeorum. (in Latin). Francofurti : Tampach. “anno aerae nostrae vulgaris”
Common use?! Nope. Individual exceptions...none of which are codified into law.
Write “CE” into your house contract instead of “AD” and the other party will have grounds to nullify a sale after the fact.