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In page Saturday Night Fever:

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When HBO acquired the pay television rights to Saturday Night Fever in 1980, both versions of the film were aired by the network: the PG version during the day, and the R version during the evening (HBO, which had primarily operated on a late afternoon-to-early overnight schedule at the time, had maintained a programming policy restricting the showing of R-rated films to the nighttime hours, a rule that continued long after it switched to a 24-hour schedule full-time in December 1981). The R-rated theatrical version premiered on the network at midnight Eastern Time on January 1, 1980.[citation needed]