/*
 * Copyright 2008 Google Inc.
 * 
 * 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
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.gwt.i18n.client;

import com.google.gwt.junit.client.GWTTestCase;

import java.util.Date;

/**
 * Tests parsing functionality in {@link DateTimeFormat} for the English
 * language.
 */
@SuppressWarnings("deprecation")
public class DateTimeParse_en_Test extends GWTTestCase {
  // TODO: replace the rest of the assertTrue calls to assertEquals
  //    for better error reporting, where possible.

  @Override
  public String getModuleName() {
    return "com.google.gwt.i18n.I18NTest_en";
  }

  public void testAbutField() {
    Date date = new Date();

    assertTrue(parse("hhmm", "1122", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("hhmm", "122", 0, date) > 0);
    assertEquals(1, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("hhmmss", "112233", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());
    assertEquals(33, date.getSeconds());

    assertTrue(parse("hhmmss", "12233", 0, date) > 0);
    assertEquals(1, date.getHours());
    assertEquals(22, date.getMinutes());
    assertEquals(33, date.getSeconds());

    assertTrue(parse("yyyyMMdd", "19991202", 0, date) > 0);
    assertEquals(1999 - 1900, date.getYear());
    assertEquals(12 - 1, date.getMonth());
    assertEquals(2, date.getDate());

    assertTrue(parse("yyyyMMdd", "9991202", 0, date) > 0);
    assertEquals(999 - 1900, date.getYear());
    assertEquals(12 - 1, date.getMonth());
    assertEquals(2, date.getDate());

    assertTrue(parse("yyyyMMdd", "991202", 0, date) > 0);
    assertEquals(99 - 1900, date.getYear());
    assertEquals(12 - 1, date.getMonth());
    assertEquals(2, date.getDate());

    assertTrue(parse("yyyyMMdd", "91202", 0, date) > 0);
    assertEquals(9 - 1900, date.getYear());
    assertEquals(12 - 1, date.getMonth());
    assertEquals(2, date.getDate());

    assertEquals(6, parse("dd HHmm", "11 213", 0, date));
    assertEquals(11, date.getDate());
    assertEquals(2, date.getHours());
    assertEquals(13, date.getMinutes());
  }

  public void testAmbiguousYear() {
    Date date = new Date();
    if (date.getMonth() == 0 && date.getDate() == 1 || date.getMonth() == 11
        && date.getDate() >= 31) {
      // we are using current time to resolve ambiguous year.
      // This test case is not designed to work on new year's eve and new year.
      return;
    }

    Date orgDate = new Date();
    orgDate.setYear(orgDate.getYear() + 20);

    orgDate.setMonth(0);
    orgDate.setDate(1);
    String str = format("MM/dd/yy", orgDate);
    assertTrue(parse("MM/dd/yy", str, 0, date) > 0);
    assertEquals(date.getYear(), orgDate.getYear());

    orgDate.setMonth(11);
    orgDate.setDate(31);
    str = format("MM/dd/yy", orgDate);
    assertTrue(parse("MM/dd/yy", str, 0, date) > 0);
    assertEquals(date.getYear() + 100, orgDate.getYear());

    assertTrue(parse("yy,MM,dd", "2097,07,21", 0, date) > 0);
    assertEquals(2097 - 1900, date.getYear());
  }

  /**
   * Parse the pattern MMMMyyyy when the day of the current month is passed the
   * last day of the parsed leap month. For example, parse "February2004" (leap
   * month) on January 31. The date should be limited to the last day of the
   * month.
   */
  public void testCurrentDayInvalidInParsedLeapMonth() {
    // Parse "February2004" (leap year) on January 31, 2006.
    Date date = new Date(2006 - 1900, 0, 31, 12, 0, 0);
    DateTimeFormat format = DateTimeFormat.getFormat("MMMMyyyy");
    assertEquals(12, format.parse("February2004", 0, date));
    assertEquals(2004 - 1900, date.getYear());
    assertEquals(1, date.getMonth());
    assertEquals(29, date.getDate());
  }

  /**
   * Parse the pattern MMMMyyyy when the day of the current month is passed the
   * last day of the parsed month. For example, parse "February2006" on January
   * 31. The date should be limited to the last day of the month.
   */
  public void testCurrentDayInvalidInParsedMonth() {
    // Parse "February2006" on January 31, 2006.
    Date date = new Date(2006 - 1900, 0, 31, 12, 0, 0);
    DateTimeFormat format = DateTimeFormat.getFormat("MMMMyyyy");
    assertEquals(12, format.parse("February2006", 0, date));
    assertEquals(2006 - 1900, date.getYear());
    assertEquals(1, date.getMonth());
    assertEquals(28, date.getDate());
  }

  /**
   * Parse the pattern MMMMyyyy when the day of the current month is passed the
   * last day of the parsed month. For example, parse "February2006" on January
   * 31. The date should be limited to the last day of the month.
   */
  public void testCurrentDayInvalidInParsedMonthStrict() {
    // Parse "February2006" on January 31, 2006.
    Date date = new Date(2006 - 1900, 0, 31, 12, 0, 0);
    DateTimeFormat format = DateTimeFormat.getFormat("MMMMyyyy");
    assertEquals(12, format.parseStrict("February2006", 0, date));
    assertEquals(2006 - 1900, date.getYear());
    assertEquals(1, date.getMonth());
    assertEquals(28, date.getDate());
  }

  /**
   * Parse the pattern MMMMyyyy when the day of the current month is within the
   * last day of the parsed month. For example, parse "February2006" on January
   * 10.
   */
  public void testCurrentDayValidInParsedMonth() {
    // Set the date to January 31, 2006.
    Date date = new Date(2006 - 1900, 0, 10, 12, 0, 0);
    DateTimeFormat format = DateTimeFormat.getFormat("MMMMyyyy");
    assertEquals(12, format.parse("February2006", 0, date));
    assertEquals(2006 - 1900, date.getYear());
    assertEquals(1, date.getMonth());
    assertEquals(10, date.getDate());
  }

  public void testDayOfWeek() {
    Date date = new Date();

    assertTrue(parse("EEE", "Wed", 0, date) > 0);
    assertEquals(3, date.getDay());
    assertTrue(parse("EEEE", "Thursday", 0, date) > 0);
    assertEquals(4, date.getDay());
  }

  /**
   * Issue 4633: Test that an empty integer value throws an
   * {@link IllegalArgumentException}, but does not throw an
   * {@link IndexOutOfBoundsException}.
   */
  public void testEmptyIntegerValue() {
    char[] parts = new char[] {'M', 'd', 'y', 'h', 'H', 'm', 's', 'S', 'k'};
    for (int i = 0; i < parts.length; i++) {
      DateTimeFormat format = DateTimeFormat.getFormat("M/" + parts[i]);
      try {
        format.parse("1/");
        fail("Expected IllegalArgumentException");
      } catch (IllegalArgumentException e) {
        // Expected.
      }
    }
  }

  public void testEnglishDate() {
    Date date = new Date();

    assertTrue(parse("yyyy MMM dd hh:mm", "2006 Jul 10 15:44", 0, date) > 0);
    assertEquals(2006 - 1900, date.getYear());
    assertEquals(7 - 1, date.getMonth());
    assertEquals(10, date.getDate());
    assertEquals(15, date.getHours());
    assertEquals(44, date.getMinutes());
  }

  /**
   * Add as many tests as you like.
   */
  public void testFractionalSeconds() {
    Date date = new Date();

    assertTrue(parse("hh:mm:ss.SSS", "11:12:13.956", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(12, date.getMinutes());
    assertEquals(13, date.getSeconds());
    assertEquals(956, (date.getTime() % 1000));

    assertTrue(parse("hh:mm:ss.SSS", "11:12:13.95", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(12, date.getMinutes());
    assertEquals(13, date.getSeconds());
    assertEquals(950, (date.getTime() % 1000));

    assertTrue(parse("hh:mm:ss.SSS", "11:12:13.9", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(12, date.getMinutes());
    assertEquals(13, date.getSeconds());
    assertEquals(900, (date.getTime() % 1000));
  }

  public void testHourParsingFhh() {
    Date date = new Date();

    assertTrue(parse("hhmm", "0022", 0, date) > 0);
    assertTrue(date.getHours() == 00);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmm", "1122", 0, date) > 0);
    assertTrue(date.getHours() == 11);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmm", "1222", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmm", "2322", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmm", "2422", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "0022am", 0, date) > 0);
    assertTrue(date.getHours() == 00);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "1122am", 0, date) > 0);
    assertTrue(date.getHours() == 11);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "1222am", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "2322am", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "2422am", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "0022pm", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "1122pm", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "1222pm", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "2322pm", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("hhmma", "2422pm", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);
  }

  public void testHourParsingFHH() {
    Date date = new Date();
    assertTrue(parse("HHmm", "0022", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmm", "1122", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmm", "1222", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmm", "2322", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmm", "2422", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "0022am", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "1122am", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "1222am", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "2322am", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "2422am", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "0022pm", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "1122pm", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "1222pm", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "2322pm", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("HHmma", "2422pm", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());
  }

  public void testHourParsingFkk() {
    Date date = new Date();
    assertTrue(parse("kkmm", "0022", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmm", "1122", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmm", "1222", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmm", "2322", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmm", "2422", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "0022am", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "1122am", 0, date) > 0);
    assertEquals(11, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "1222am", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "2322am", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "2422am", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "0022pm", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "1122pm", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "1222pm", 0, date) > 0);
    assertEquals(12, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "2322pm", 0, date) > 0);
    assertEquals(23, date.getHours());
    assertEquals(22, date.getMinutes());

    assertTrue(parse("kkmma", "2422pm", 0, date) > 0);
    assertEquals(0, date.getHours());
    assertEquals(22, date.getMinutes());

    DateTimeFormat dtf = DateTimeFormat.getFormat("yyyy-MM-dd kk:mm:ss.SZ");
    long time = Date.UTC(2013 - 1900, 1 - 1, 1, 0, 34, 56);
    date = dtf.parse("2013-01-01 24:34:56.000-0000");
    assertEquals(time, date.getTime());
    // Should succeed to parse
    date = dtf.parseStrict("2013-01-01 24:34:56.000-0000");
    assertEquals(time, date.getTime());

    try {
      dtf.parseStrict("2013-01-01 00:34:56.000-0000");
      fail("Should have thrown an exception on failure to parse");
    } catch (IllegalArgumentException e) {
      // Success
    }
  }

  public void testHourParsingFKK() {
    Date date = new Date();
    assertTrue(parse("KKmm", "0022", 0, date) > 0);
    assertTrue(date.getHours() == 00);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmm", "1122", 0, date) > 0);
    assertTrue(date.getHours() == 11);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmm", "1222", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmm", "2322", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmm", "2422", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "0022am", 0, date) > 0);
    assertTrue(date.getHours() == 00);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "1122am", 0, date) > 0);
    assertTrue(date.getHours() == 11);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "1222am", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "2322am", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "2422am", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "0022pm", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "1122pm", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "1222pm", 0, date) > 0);
    assertTrue(date.getHours() == 12);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "2322pm", 0, date) > 0);
    assertTrue(date.getHours() == 23);
    assertTrue(date.getMinutes() == 22);

    assertTrue(parse("KKmma", "2422pm", 0, date) > 0);
    assertTrue(date.getHours() == 0);
    assertTrue(date.getMinutes() == 22);
  }

  public void testInvalidDayAndMonth() {
    DateTimeFormat fmt = DateTimeFormat.getFormat("MM/dd/yyyy");
    try {
      fmt.parseStrict("00/22/1999");
      fail("Should have thrown an exception on failure to parse");
    } catch (IllegalArgumentException e) {
      // Success
    }
    try {
      fmt.parseStrict("01/00/1999");
      fail("Should have thrown an exception on failure to parse");
    } catch (IllegalArgumentException e) {
      // Success
    }
    try {
      fmt.parseStrict("01/22/1999");
      // Success
    } catch (IllegalArgumentException e) {
      fail("Should succeed to parse");
    }
  }

  public void testLeapYear() {
    Date date = new Date();

    assertTrue(parse("MMdd, yyyy", "0229, 2001", 0, date) > 0);
    assertTrue(date.getMonth() == 3 - 1);
    assertTrue(date.getDate() == 1);

    assertTrue(parse("MMdd, yyyy", "0229, 2000", 0, date) > 0);
    assertTrue(date.getMonth() == 2 - 1);
    assertTrue(date.getDate() == 29);
  }

  public void testLenientParsing() {
    Date date = new Date();
    DateTimeFormat fmt = DateTimeFormat.getFormat("yyyy.MM.dd hh:mm:ss.SSS aa ZZZZ");

    // Valid date
    String dateStr = "2000.01.01 05:06:07.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertTrue(fmt.parseStrict(dateStr, 0, date) > 0);

    // Invalid Month
    dateStr = "2000.13.01 05:06:07.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Invalid Day
    dateStr = "2000.01.32 05:06:07.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Invalid Hour
    dateStr = "2000.01.01 24:06:07.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Invalid Minute
    dateStr = "2000.01.01 05:60:07.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Invalid Second
    dateStr = "2000.01.01 05:06:60.123 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Invalid Millisecond
    dateStr = "2000.01.01 05:06:07.9998 PM +000";
    assertTrue(fmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, fmt.parseStrict(dateStr, 0, date));

    // Two Digit Year, but valid date
    DateTimeFormat yyFmt = DateTimeFormat.getFormat("yy.MM.dd");
    dateStr = "97.01.01";
    assertTrue(yyFmt.parse(dateStr, 0, date) > 0);
    assertTrue(yyFmt.parseStrict(dateStr, 0, date) > 0);

    // Two Digit Year, invalid date
    dateStr = "97.01.40";
    assertTrue(yyFmt.parse(dateStr, 0, date) > 0);
    assertEquals(0, yyFmt.parseStrict(dateStr, 0, date));

    // Invalid date, throwing an exception
    dateStr = "97.01.40";
    try {
      yyFmt.parseStrict(dateStr);
      fail("Should have thrown an exception on failure to parse");
    } catch (IllegalArgumentException e) {
      // Success
    }

    // Ambiguous next century, valid date
    Date today = new Date();
    Date ambNext = new Date(today.getTime() + 86400000);
    ambNext.setYear(today.getYear() + 20);
    String sAmbNext = yyFmt.format(ambNext);
    assertTrue(yyFmt.parse(sAmbNext, 0, date) > 0);
    assertTrue(yyFmt.parseStrict(sAmbNext, 0, date) > 0);

    // Ambiguous previous century, valid date
    Date ambPrev = new Date(today.getTime() - 86400000);
    ambPrev.setYear(today.getYear() + 20);
    String sAmbPrev = yyFmt.format(ambPrev);
    assertTrue(yyFmt.parse(sAmbPrev, 0, date) > 0);
    assertTrue(yyFmt.parseStrict(sAmbPrev, 0, date) > 0);

    // Ambiguous Year, invalid date
    sAmbNext = sAmbNext.substring(0, 6) + "32";
    assertTrue(yyFmt.parse(sAmbPrev, 0, date) > 0);
    assertEquals(0, yyFmt.parseStrict(sAmbNext, 0, date));
  }

  public void testMonth() {
    Date date = new Date(1980, 1, 1);

    assertTrue(parse("MM", "03", 0, date) > 0);
    assertEquals(2, date.getMonth());
    assertTrue(parse("MMM", "Feb", 0, date) > 0);
    assertEquals(1, date.getMonth());
    assertTrue(parse("MMMM", "July", 0, date) > 0);
    assertEquals(6, date.getMonth());
  }

  public void testParseConsumesAllCharacters() {
    String toParse = "July 11, 1938";
    DateTimeFormat longDateFormat = DateTimeFormat.getLongDateFormat();

    Date actualDate = longDateFormat.parse(toParse);
    String actualFormat = longDateFormat.format(actualDate);
    assertEquals(toParse, actualFormat);

    try {
      String toParseMangled = toParse + " asdfasdfasdf";
      longDateFormat.parse(toParseMangled);
      fail("Should have thrown an exception on failure to parse");
    } catch (IllegalArgumentException e) {
      // Success.
    }
  }

  public void testPartialParsing() {
    // Only specify a date
    DateTimeFormat fmt = DateTimeFormat.getFormat("MM-dd-yyyy");
    Date dateActual = new Date(87, 10, 22);
    Date dateOnly = fmt.parse("11-22-1987");
    assertEquals(0, dateOnly.getHours());
    assertEquals(0, dateOnly.getMinutes());
    assertEquals(0, dateOnly.getSeconds());
    assertEquals(dateOnly.getTime(), dateActual.getTime());

    // Only specify a time, should use current date
    fmt = DateTimeFormat.getFormat("hha");
    dateOnly = fmt.parse("4PM");
    assertEquals(16, dateOnly.getHours());
    assertEquals(0, dateOnly.getMinutes());
    assertEquals(0, dateOnly.getSeconds());
  }

  public void testRFC3339() {
    Date date = new Date();

    {
      // Parse a string formatted according to RFC3389.
      String rfc3339str = "1985-04-12T23:20:50.52-08:00";
      assertTrue(parse("yyyy-MM-dd'T'HH:mm:ss.SSZ", rfc3339str, 0, date) > 0);

      // Create the expected time as UTC. The "+8" is due to the tz offset.
      long expectedTimeUTC = Date.UTC(1985 - 1900, 3, 12, 23 + 8, 20, 50);
      Date expectedDate = new Date(expectedTimeUTC);
      assertEquals(expectedDate.getYear(), date.getYear());
      assertEquals(expectedDate.getMonth(), date.getMonth());
      assertEquals(expectedDate.getDate(), date.getDate());
      assertEquals(expectedDate.getHours(), date.getHours());
      assertEquals(expectedDate.getMinutes(), date.getMinutes());
      assertEquals(expectedDate.getSeconds(), date.getSeconds());
      // Make sure our parse captured the extra 520 milliseconds.
      assertEquals(520, date.getTime() % 1000);
    }

    {
      // Parse a string formatted according to RFC3389.
      String rfc3339str = "1985-04-12T23:20:50.52Z";
      if (rfc3339str.endsWith("Z")) {
        StringBuffer strbuf = new StringBuffer(rfc3339str);
        strbuf.deleteCharAt(rfc3339str.length() - 1);
        strbuf.append("+00:00");
        rfc3339str = strbuf.toString();
      }
      assertTrue(parse("yyyy-MM-dd'T'HH:mm:ss.SSZ", rfc3339str, 0, date) > 0);

      // Create the expected time as UTC. The "+0" is because it's already GMT.
      long expectedTimeUTC = Date.UTC(85, 3, 12, 23 + 0, 20, 50);
      Date expectedDate = new Date(expectedTimeUTC);
      assertEquals(expectedDate.getYear(), date.getYear());
      assertEquals(expectedDate.getMonth(), date.getMonth());
      assertEquals(expectedDate.getDate(), date.getDate());
      assertEquals(expectedDate.getHours(), date.getHours());
      assertEquals(expectedDate.getMinutes(), date.getMinutes());
      assertEquals(expectedDate.getSeconds(), date.getSeconds());
      // Make sure our parse captured the extra 520 milliseconds.
      assertEquals(520, date.getTime() % 1000);
    }
  }

  public void testStandloneDayOfWeek() {
    Date date = new Date(1980, 1, 1);

    assertTrue(parse("ccc", "Wed", 0, date) > 0);
    assertEquals(3, date.getDay());
    assertTrue(parse("cccc", "Thursday", 0, date) > 0);
    assertEquals(4, date.getDay());
  }

  public void testStandloneMonth() {
    Date date = new Date(1980, 1, 1);

    assertTrue(parse("LL", "03", 0, date) > 0);
    assertEquals(2, date.getMonth());
    assertTrue(parse("LLL", "Feb", 0, date) > 0);
    assertEquals(1, date.getMonth());
    assertTrue(parse("LLLL", "July", 0, date) > 0);
    assertEquals(6, date.getMonth());
  }

  public void testTimeZone() {
    Date date = new Date();

    assertTrue(parse("MM/dd/yyyy, hh:mm:ss zzz",
        "07/21/2003, 11:22:33 GMT-0700", 0, date) > 0);
    int gmtNegative07 = date.getHours();

    assertTrue(parse("MM/dd/yyyy, hh:mm:ss zzz",
        "07/21/2003, 11:22:33 GMT-0600", 0, date) > 0);
    int gmtNegative06 = date.getHours();
    assertTrue((gmtNegative07 + 24 - gmtNegative06) % 24 == 1);

    assertTrue(parse("MM/dd/yyyy, hh:mm:ss zzz",
        "07/21/2003, 11:22:33 GMT-0800", 0, date) > 0);
    int gmtNegative08 = date.getHours();
    assertTrue((gmtNegative08 + 24 - gmtNegative07) % 24 == 1);

    assertTrue(parse("MM/dd/yyyy, HH:mm:ss zzz",
        "07/21/2003, 11:22:33 GMT+0800", 0, date) > 0);
    int gmtPositive08 = date.getHours();
    assertTrue((gmtNegative08 + 24 - gmtPositive08) % 24 == 16);
  }

  public void testWeekDay() {
    Date date = new Date();

    assertTrue(parse("EEEE, MM/dd/yyyy", "Wednesday, 08/16/2006", 0, date) > 0);
    assertTrue(date.getYear() == 2006 - 1900);
    assertTrue(date.getMonth() == 8 - 1);
    assertTrue(date.getDate() == 16);
    assertTrue(parse("EEEE, MM/dd/yyyy", "Tuesday, 08/16/2006", 0, date) == 0);
    assertTrue(parse("EEEE, MM/dd/yyyy", "Thursday, 08/16/2006", 0, date) == 0);
    assertTrue(parse("EEEE, MM/dd/yyyy", "Wed, 08/16/2006", 0, date) > 0);
    assertTrue(parse("EEEE, MM/dd/yyyy", "Wasdfed, 08/16/2006", 0, date) == 0);

    date.setDate(25);
    assertTrue(parse("EEEE, MM/yyyy", "Wed, 09/2006", 0, date) > 0);
    assertTrue(date.getDate() == 27);

    date.setDate(30);
    assertTrue(parse("EEEE, MM/yyyy", "Wed, 09/2006", 0, date) > 0);
    assertTrue(date.getDate() == 27);

    date.setDate(30);
    assertTrue(parse("EEEE, MM/yyyy", "Mon, 09/2006", 0, date) > 0);
    assertTrue(date.getDate() == 25);
  }

  public void testYearParsing() {
    Date date = new Date();

    assertTrue(parse("yyMMdd", "991202", 0, date) > 0);
    assertTrue(date.getYear() == (1999 - 1900));
    assertTrue(date.getMonth() == 12 - 1);
    assertTrue(date.getDate() == 02);

    assertTrue(parse("yyyyMMdd", "20051202", 0, date) > 0);
    assertTrue(date.getYear() == (2005 - 1900));
    assertTrue(date.getMonth() == 12 - 1);
    assertTrue(date.getDate() == 02);
  }

  private String format(String pattern, Date toFormat) {
    DateTimeFormat fmt = DateTimeFormat.getFormat(pattern);
    return fmt.format(toFormat);
  }

  private int parse(String pattern, String toParse, int startIndex, Date output) {
    DateTimeFormat fmt = DateTimeFormat.getFormat(pattern);
    return fmt.parse(toParse, startIndex, output);
  }
}