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Java SDK for Contentstack Content Delivery API
There is a newer version: 2.0.2
package com.contentstack.sdk.utility;


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

/**
 * MIT License
 *
 * Copyright (c) 2012 - 2019 Contentstack
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

public class ContentstackUtil {

    /**
     * Converts the given date to user's timezone.
     * @param date date in ISO format.
     * @param timeZone timezone selection
     * @return {@link Calendar} object.
     * @throws ParseException
     *
     * 

Example :

     *      *   BuiltUtil.parseDate(dateString, TimeZone.getDefault());
     * 
     *
     */
    public static Calendar parseDate(String date, TimeZone timeZone) throws ParseException {
        ArrayList knownPatterns = new ArrayList();
        knownPatterns.add("yyyy-MM-dd'T'HH:mm:ssZ");
        knownPatterns.add("yyyy-MM-dd'T'HH:mm:ss'Z'");
        knownPatterns.add("yyyy-MM-dd'T'HH:mm.ss'Z'");
        knownPatterns.add("yyyy-MM-dd'T'HH:mmZ");
        knownPatterns.add("yyyy-MM-dd'T'HH:mm'Z'");
        knownPatterns.add("yyyy-MM-dd'T'HH:mm'Z'");
        knownPatterns.add("yyyy-MM-dd'T'HH:mm:ss");
        knownPatterns.add("yyyy-MM-dd' 'HH:mm:ss");
        knownPatterns.add("yyyy-MM-dd");
        knownPatterns.add("HH:mm:ssZ");
        knownPatterns.add("HH:mm:ss'Z'");

        for (String formatString : knownPatterns){
            try {
                return parseDate(date, formatString, timeZone);

            }catch (ParseException e) {}
        }

        return null;
    }

    /**
     * Converts the given date to the user's timezone.
     * @param date date in string format.
     * @param dateFormat date format.
     * @param timeZone TimeZone.
     * @return {@link Calendar} object.
     * @return timeZone time zone
     * @throws ParseException
     *
     * 

Example :

     *      *   BuiltUtil.parseDate(dateString, "yyyy-MM-dd'T'HH:mm:ssZ", TimeZone.getTimeZone("GMT"));
     * 
     */

    public static Calendar parseDate(String date, String dateFormat, TimeZone timeZone) throws ParseException {
        Date dateObject   = null;
        String month      = "";
        String day        = "";
        String year       = "";
        String hourOfDay  = "";
        String min        = "";
        String sec        = "";
        Calendar cal      = Calendar.getInstance();

        SimpleDateFormat dateFormatter = new SimpleDateFormat(dateFormat);
        dateObject = dateFormatter.parse(date);

        month     = new SimpleDateFormat("MM").format(dateObject);
        day       = new SimpleDateFormat("dd").format(dateObject);
        year      = new SimpleDateFormat("yyyy").format(dateObject);
        hourOfDay = new SimpleDateFormat("HH").format(dateObject);
        min       = new SimpleDateFormat("mm").format(dateObject);
        sec       = new SimpleDateFormat("ss").format(dateObject);

        if(timeZone != null){
            cal.setTimeZone(timeZone);
        }else{
            cal.setTimeZone(TimeZone.getDefault());
        }

        cal.set(Integer.valueOf(year), Integer.valueOf(month)-1, Integer.valueOf(day), Integer.valueOf(hourOfDay), Integer.valueOf(min), Integer.valueOf(sec));

        month     = null;
        day       = null;
        year      = null;
        hourOfDay = null;
        min       = null;
        sec       = null;
        dateObject = null;

        return cal;
    }

}