619.23. The provisions of sections 278 to 280, 282 to 300, 350, 351, 386 to 395, 463 to 467, 475 and 476 have effect with regard to the fiscal year beginning on 1 April 1993. Until that date or any later date determined by the Government, public institutions, private institutions under agreement and regional boards shall continue to be governed by the rules applicable to the financing of their activities and to their financial resources during the fiscal year beginning on 1 April 1992.