Is it true that President Nixon signed the Uniform Monday Holiday act in to effect in 1968 but it didn't take place until 1971?

Yes, it's true. President Nixon signed the Uniform Monday Holiday Act into law in 1968, which aimed to create more three-day weekends for the nation's workers by moving the observance of certain holidays to Mondays. However, the act did not go into effect until January 1, 1971.