Java Utililty Methods Date RFC Format

return (RFC822.format(date));

SimpleDateFormat df = new SimpleDateFormat("EEE', 'dd' 'MMM' 'yyyy' 'HH:mm:ss' 'Z", Locale.US);
return df.format(date);

if (date == null) {
    return null;
return RFC822DATEFORMAT.format(date);

Date lDate = null;
String[] lDateFormats = { "EEE, dd MMM yyyy kk:mm:ss z", "EEE, MMM dd yyyy kk:mm:ss z" };
if (pString != null && !"".equals(pString)) {
    SimpleDateFormat simpleFormatter = (SimpleDateFormat) formatter;
    for (int i = 0; i < lDateFormats.length; i++) {
        String lFormat = lDateFormats[i];
        simpleFormatter.applyPattern(lFormat);
        try {
...

if (d == null)
    return null;
SimpleDateFormat asGMTrfc1123 = new SimpleDateFormat(PATTERN_RFC1123); 
asGMTrfc1123.setTimeZone(TimeZone.getTimeZone("GMT"));
return asGMTrfc1123.format(d);

return RFC_1123.get().format(date);

String pattern = "EEE, dd MMM yyyy HH:mm:ss Z"; 
SimpleDateFormat format = new SimpleDateFormat(pattern);
return format.format(date);

DateFormat dateFormat = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z", Locale.US);
TimeZone zone = new SimpleTimeZone(8, "GMT");
dateFormat.setTimeZone(zone);
return dateFormat.format(date);

final String DateFormat = "EEE, dd MMM yyyy HH:mm:ss ";
SimpleDateFormat format;
format = new SimpleDateFormat(DateFormat, Locale.US);
format.setTimeZone(TimeZone.getTimeZone("GMT"));
return format.format(date) + "GMT";

synchronized (rfc822GMTFormat) {
    return rfc822GMTFormat.format(val);