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In page French Republican calendar:

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Décadis became an official day of rest instead of Sunday, in order to diminish the influence of the Roman Catholic Church. They were used for the festivals of a succession of new religions meant to replace Catholicism: the Cult of Reason, the Cult of the Supreme Being, the Decadary Cult, and Theophilanthropy. Christian holidays were officially abolished in favor of revolutionary holidays. The law of 13 Fructidor year VI (30 August 1798) required that marriages must only be celebrated on décadis. This law was applied from the 1st Vendémiaire year VII (22 September 1798) to 28 Pluviôse year VIII (17 February 1800).[citation needed]