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/**
 * 
 */
package com.ch.util;

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


/**
 * @author ravindra
 *
 */
public class DateTimeUtils {
	private static final String DATE_FORMAT_PATTERN = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";

	public static String getSystemTimeZone() {
		Calendar calendar = Calendar.getInstance();
		TimeZone timeZone = calendar.getTimeZone();
		return timeZone.getID();
	}

	public static String convertDateToUTC(Date date) {
		SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_PATTERN);
		TimeZone timeZone = TimeZone.getTimeZone("UTC");
		sdf.setTimeZone(timeZone);
		return sdf.format(date);
		 
	}

	public static String calculateEndTime(Date startDate, Date endDate) {
		long duration = endDate.getTime() - startDate.getTime();
		String format = String.format("%%0%dd", 2);
		duration = duration / 1000;
		String seconds = String.format(format, duration % 60);
		String minutes = String.format(format, (duration % 3600) / 60);
		String hours = String.format(format, duration / 3600);
		return hours + ":" + minutes + ":" + seconds;
	}
	
	public static boolean isValid(String dateStr) {
        DateFormat sdf = new SimpleDateFormat(DATE_FORMAT_PATTERN);
        sdf.setLenient(false);
        try {
            sdf.parse(dateStr);
        } catch (ParseException e) {
            return false;
        }
        return true;
    }
}