On March 28 , 1794 , Joseph Louis Lagrange , the president of the commission which developed the metric system , wrote a report to the commission . His report suggested the names dÃ ci-jour and centi-jour ( deciday and centiday in English ) . On March 28 , 1794 , the president of the commission which developed the metric system , Joseph Louis Lagrange , proposed in a report to the commission the names dÃ ci-jour and centi-jour ( deciday and centiday in English ) .