I can't say "there is no standard of that format" of course, because I very well may have just missed it. But when I started working with the Twitter API I did search for awhile to find the standard they are using and couldn't find a match. I ended up having to define a custom format (c#):
DateTime.ParseExact(twitterDateString,
"ddd MMM dd HH:mm:ss %K yyyy",
CultureInfo.InvariantCulture.DateTimeFormat);
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