GMT (UTC) Time Converter : Time « Date Type « Android






  1. Android
  2. Date Type
  3. Time

GMT (UTC) Time Converter

  
/* 
 * Copyright 2010 TYTung.
 * 
 * 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 tyt.android.bigplanettracks.tracks;

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

/**
 * GMT (UTC) Time Converter.
 * 
 * E.g.: GMTTime = "2009-10-09T00:37:22Z";
 * 
 * @author TYTung
 * @version 0.1
 */
public class MyTimeUtils {

  /** "Fri 2009-10-09 08:37:22 GMT+0800" // TimeZone is Taipei */
//  private static SimpleDateFormat LocalTimeFormatter = new SimpleDateFormat(
//      "EEE yyyy-MM-dd HH:mm:ss zzz", Locale.US);

  /** "Fri Oct 09 08:37:22 CST 2009" // TimeZone is Taipei, zzz=[GMT+0800 in Android | CST in Java] */
  private static SimpleDateFormat LocalTimeFormatter = new SimpleDateFormat(
      "EEE MMM dd HH:mm:ss zzz yyyy", Locale.US);

  private static SimpleDateFormat GMTTimeFormatter = new SimpleDateFormat(
      "yyyy-MM-dd'T'HH:mm:ss'Z'");
  {
    GMTTimeFormatter.setTimeZone(TimeZone.getTimeZone("GMT"));
  }
  
  public static boolean isGMTTimeFormat(String strGMTTime) {
    boolean isValid = false;
    try {
      GMTTimeFormatter.parse(strGMTTime);
      isValid = true;
    } catch (ParseException e) {
    }
    if (strGMTTime.length() != 20)
      isValid = false;
    return isValid;
  }
  
  public static long getGMTTime(String strGMTTime) {
    long millisecond = 0;
    try {
      millisecond = GMTTimeFormatter.parse(strGMTTime).getTime();
    } catch (ParseException e) {
      if (strGMTTime.length() > 0)
        e.printStackTrace();
      else
        System.err.println(e.getMessage());
    }
    return millisecond;
  }
  
  public static long getLocalTime(String strLocalTime) {
    long millisecond = 0;
    try {
      LocalTimeFormatter.setTimeZone(TimeZone.getDefault());
      millisecond = LocalTimeFormatter.parse(strLocalTime).getTime();
    } catch (ParseException e) {
      e.printStackTrace();
    }
    return millisecond;
  }
  
  public static String getLocalTimeString(String strGMTTime) {
    String strLocalTime = null;
    try {
      GMTTimeFormatter.setTimeZone(TimeZone.getTimeZone("GMT"));
      Date date = GMTTimeFormatter.parse(strGMTTime);
      LocalTimeFormatter.setTimeZone(TimeZone.getDefault());
      strLocalTime = LocalTimeFormatter.format(date);
    } catch (ParseException e) {
      e.printStackTrace();
    }
    return strLocalTime;
  }
  
  public static String getLocalTimeString(long millisecond) {
    LocalTimeFormatter.setTimeZone(TimeZone.getDefault());
    String strLocalTime = LocalTimeFormatter.format(millisecond);
    return strLocalTime;
  }

  public static String getGMTTimeString(long millisecond) {
    Calendar cal = Calendar.getInstance();
    int zoneOffsetTime = cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET);
    long millisecondsUTC = millisecond - zoneOffsetTime;
    GMTTimeFormatter.setTimeZone(TimeZone.getDefault());
    String strGMTTime = GMTTimeFormatter.format(millisecondsUTC);
    return strGMTTime;
  }

  public static String getTimeString(long millisecond) {
    String timeString = "";

    int totalSeconds = (int) millisecond / 1000;
    int hours = totalSeconds / 3600;
    int remainder = totalSeconds % 3600;
    int minutes = remainder / 60;
    int seconds = remainder % 60;

    if (hours == 0) {
      timeString = minutes + ":" + seconds;
    } else {
      timeString = hours + ":" + minutes + ":" + seconds;
    }
    return timeString;
  }
  
  private MyTimeUtils() {
  }
  
}








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