From the Apostolic Letter Dies Domini of His late Holiness John Paul II:
It would therefore be wrong to see in this legislation [for Sabbath rest] of the rhythm of the week a mere historical circumstance with no special significance for the Church and which she could simply set aside. Even after the fall of the Empire, the Councils did not cease to insist upon the arrangements regarding Sunday rest.Wouldn’t the A.C.B.C.’s latest Social Justice Statement have been a splendid opportunity to remind the faithful of these things? And note that Dies Domini does not speak of compensation, by means of penalty rates, for working unsociable hours, but only of ensuring that the civil law safeguards the sanctification of Sunday.
[…] my predecessor Pope Leo XIII in his Encyclical Rerum Novarum spoke of Sunday rest as a worker's right which the State must guarantee.
[…] also in the particular circumstances of our own time, Christians will naturally strive to ensure that civil legislation respects their duty to keep Sunday holy. In any case, they are obliged in conscience to arrange their Sunday rest in a way which allows them to take part in the Eucharist, refraining from work and activities which are incompatible with the sanctification of the Lord's Day, with its characteristic joy and necessary rest for spirit and body.