When was that?
Have I got some dates for you,
:
January 30, 2020 - CDC recommended against people wearing face masks;
https://www.marketwatch.com/story/the-cdc-says-americans-dont-have-to-wear-facemasks-because-of-coronavirus-2020-01-30January 30, 2020 - Dr. Nancy Messonnier, director of the Center for the National Center for Immunization and Respiratory Diseases, said, "We don’t routinely recommend the use of face masks by the public to prevent respiratory illness. And we certainly are not recommending that at this time for this new virus.";
https://www.marketwatch.com/story/the-cdc-says-americans-dont-have-to-wear-facemasks-because-of-coronavirus-2020-01-30 ;
https://abcnews.go.com/Health/delta-suspends-us-flights-china-amid-coronavirus/story?id=68666037February 13, 2020 - CDC has released new information regarding the use of PPE, including masks; the general public is advised to not use facemasks;
https://www.krqe.com/health/coronavirus/nmdoh-cdc-advise-general-public-against-using-facemasks-to-prevent-coronavirus/February 29, 2020 - Surgeon General Jerome Adams, "(Masks) are NOT effective in preventing general public from catching #Coronavirus";
https://twitter.com/Surgeon_General/status/1233725785283932160March 2, 2020 - Surgeon General Jerome Adams, "(Masks have) not been proven to be effective in preventing the spread of coronavirus amongst the general public";
https://www.snopes.com/fact-check/surgeon-general-against-masks/March 8, 2020 - Dr. Anthony Fauci, "There's no reason to be walking around with a mask";
https://www.cbsnews.com/news/preventing-coronavirus-facemask-60-minutes-2020-03-08/March 30, 2020 - Arleen Purcell, CDC spokeswoman, reiterated existing CDC guidelines that people who are well should not wear the masks to prevent contracting the virus;
https://www.politico.com/news/2020/03/30/coronavirus-masks-trump-administration-156327March 30, 2020 - Dr. Mike Ryan, executive director of the WHO health emergencies program, said, "There is no specific evidence to suggest that the wearing of masks by the mass population has any potential benefit.";
https://www.cnn.com/2020/03/30/world/coronavirus-who-masks-recommendation-trnd/index.htmlMarch 30, 2020 - Dr. Dr. Maria Van Kerkhove, an infectious disease epidemiologist with the WHO said, "In the community, we do not recommend the use of wearing masks unless you yourself are sick ...";
https://www.cnn.com/2020/03/30/world/coronavirus-who-masks-recommendation-trnd/index.htmlMarch 31, 2020 - Surgeon General Jerome Adams, "What the World Health Organization [WHO] and the CDC [The Centers for Disease Control and Prevention] have reaffirmed in the last few days is that they do not recommend the general public wear masks.";
https://www.foxnews.com/media/surgeon-general-explains-masks-public-coronavirusMarch 31, 2020 - CDC reconsidering advice against public wearing of masks to prevent Covid-19 spread;
https://www.washingtontimes.com/news/2020/mar/31/cdc-mask-recommendarions-coronavirus-being-reconsi/