Android Open Source - popcorn-android Http Date

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Java Source Code

 * Copyright (C) 2011 The Android Open Source Project
 *//  www . jav  a2  s.c  o m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.squareup.okhttp.internal.http;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

 * Best-effort parser for HTTP dates.
final class HttpDate {

   * Most websites serve cookies in the blessed format. Eagerly create the parser to ensure such
   * cookies are on the fast path.
  private static final ThreadLocal<DateFormat> STANDARD_DATE_FORMAT =
      new ThreadLocal<DateFormat>() {
        @Override protected DateFormat initialValue() {
          DateFormat rfc1123 = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
          return rfc1123;

  /** If we fail to parse a date in a non-standard format, try each of these formats in sequence. */
  private static final String[] BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS = new String[] {
      "EEEE, dd-MMM-yy HH:mm:ss zzz", // RFC 1036
      "EEE MMM d HH:mm:ss yyyy", // ANSI C asctime()
      "EEE, dd-MMM-yyyy HH:mm:ss z", "EEE, dd-MMM-yyyy HH-mm-ss z", "EEE, dd MMM yy HH:mm:ss z",
      "EEE dd-MMM-yyyy HH:mm:ss z", "EEE dd MMM yyyy HH:mm:ss z", "EEE dd-MMM-yyyy HH-mm-ss z",
      "EEE dd-MMM-yy HH:mm:ss z", "EEE dd MMM yy HH:mm:ss z", "EEE,dd-MMM-yy HH:mm:ss z",
      "EEE,dd-MMM-yyyy HH:mm:ss z", "EEE, dd-MM-yyyy HH:mm:ss z",

            /* RI bug 6641315 claims a cookie of this format was once served by */
      "EEE MMM d yyyy HH:mm:ss z", };

  private static final DateFormat[] BROWSER_COMPATIBLE_DATE_FORMATS =

  /** Returns the date for {@code value}. Returns null if the value couldn't be parsed. */
  public static Date parse(String value) {
    try {
      return STANDARD_DATE_FORMAT.get().parse(value);
    } catch (ParseException ignored) {
      for (int i = 0, count = BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS.length; i < count; i++) {
        DateFormat format = BROWSER_COMPATIBLE_DATE_FORMATS[i];
        if (format == null) {
          format = new SimpleDateFormat(BROWSER_COMPATIBLE_DATE_FORMAT_STRINGS[i], Locale.US);
        try {
          return format.parse(value);
        } catch (ParseException ignored) {
    return null;

  /** Returns the string for {@code value}. */
  public static String format(Date value) {
    return STANDARD_DATE_FORMAT.get().format(value);

  private HttpDate() {

Java Source Code List