Java Utililty Methods HTTP Date

String getHttpDate()
get Http Date

return getHttpDate(new Date());

String gethttpDate()
Generate an rfc822 date for use in the Date HTTP header.

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

String getHTTPDate()
get the date according to the HTTP standard

DateFormat httpDateFormat = new SimpleDateFormat("EEE', 'dd' 'MMM' 'yyyy' 'HH:mm:ss' 'Z", Locale.ENGLISH);
httpDateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
return httpDateFormat.format(new Date());

String getHttpDate()
convienence method returns current timestamp

return getHttpDate(new Date());

String getHttpDate(int days)
Format a date string in http-date format (1994年12月01日 16:00:00 GMT)

Calendar calendar = Calendar.getInstance();
long time = calendar.getTimeInMillis();
time += days * 24 * 60 * 60 * 1000L;
calendar.setTimeInMillis(time);
SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
String ret = dateFormat.format(calendar.getTime());
return ret;
...

String getHttpDate(long l)
get Http Date

return getDateString(l, "EEE, d MMM yyyy HH:mm:ss") + " GMT";

long getHttpDate(String date)
Returns long representation of the HTTP defined RFC 1123 date format.

SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss z", Locale.US);
try {
 return dateFormat.parse(date).getTime();
} catch (Exception e) {
 return -1;

Date getHttpDate(String value)
get Http Date

if (value == null) {
 return null;
Date result = null;
try {
 result = getCxfHttpDateFormat().parse(value);
} catch (ParseException ex) {
 try {
...

SimpleDateFormat getHttpDateFormat()
get Http Date Format

SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
TimeZone tZone = TimeZone.getTimeZone("GMT");
dateFormat.setTimeZone(tZone);
return dateFormat;

SimpleDateFormat getHttpDateFormat(String dataFormat, Locale defaultLocale, String defaultTimeZone)
Create a SimpleDateFormat instance given the specified template, locale, and time zone.

SimpleDateFormat dateFormat = new SimpleDateFormat(dataFormat, defaultLocale);
TimeZone tZone = TimeZone.getTimeZone(defaultTimeZone);
dateFormat.setTimeZone(tZone);
dateFormat.setLenient(false);
return dateFormat;