Is it true that if we make a good confession and receive the sacrament of Eucharist on the following Sunday of Easter all our sins will be forgiven?

Did Jesus Christ promise to St. Faustina that if people make a good confession and receive Holy Communion at mass on the second Sunday of Easter they will have a fresh (forgiveness of sins and the remission of all temporal punishment due to sin) start all over again? Or if I am wrong what was that promise that Jesus made to St. Faustina about this?