From Wikipedia:
After a series of hearings beginning in September 1949, the FCC found the RCA and CTI systems fraught with technical problems, inaccurate color reproduction, and expensive equipment, and so formally approved the CBS system as the U.S. color broadcasting standard on October 11, 1950. An unsuccessful lawsuit by RCA delayed the first commercial network broadcast in color until June 25, 1951, when a musical variety special titled simply Premiere was shown over a network of five East Coast CBS affiliates.
https://en.wikipedia.org/wiki/Color_...2011%2C%201950.
Seems to me this "day" should have an asterisk.
I would make the official day January 1, for the first Rose Parade in color.