@TeamYouTube I have no idea how but I posted this on Valentine’s Day on February 14 and it said February 15
pic.twitter.com/x2pKZiViDL
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The publish date that shows on the watch page when you make a video public on YouTube is based on Pacific Standard Time (PST). More info here: https://yt.be/help/hYAE . Hope that helps clarify.