Use Time#strftime

lib/cgi/util.rb

@@ -179,21 +179,12 @@ def unescapeElement(string, *elements)
   # Synonym for CGI.unescapeElement(str)
   alias unescape_element unescapeElement
 
-  # Abbreviated day-of-week names specified by RFC 822
-  RFC822_DAYS = %w[ Sun Mon Tue Wed Thu Fri Sat ]
-
-  # Abbreviated month names specified by RFC 822
-  RFC822_MONTHS = %w[ Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ]
-
   # Format a +Time+ object as a String using the format specified by RFC 1123.
   #
   #   CGI.rfc1123_date(Time.now)
   #     # Sat, 01 Jan 2000 00:00:00 GMT
   def rfc1123_date(time)
-    t = time.clone.gmtime
-    return format("%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
-                  RFC822_DAYS[t.wday], t.day, RFC822_MONTHS[t.month-1], t.year,
-                  t.hour, t.min, t.sec)
+    time.getgm.strftime("%a, %d %b %Y %T GMT")
   end
 
   # Prettify (indent) an HTML string.