Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

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

public class Main {
    private static final int ONE_SEC_IN_MILLISECS = 1000;
    private static final int IDOT_POSITION_IFNEG = 20;
    private static final int NORMAL_IDOT_POSITION = 19;

    /**
     * For some reason, can't find this utility method in the java framework.
     * 
     * @param sDateTime
     *            an xsd:dateTime string
     * @return an equivalent java.util.Date
     * @throws ParseException
     */
    public static Date parseXsdDateTime(String sDateTime) throws ParseException {
        final DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

        int iDotPosition = NORMAL_IDOT_POSITION;
        if (sDateTime.charAt(0) == '-') {
            iDotPosition = IDOT_POSITION_IFNEG;
        }
        Date result;
        if (sDateTime.length() <= iDotPosition) {
            return format.parse(sDateTime + "Z");
        }

        String millis = null;
        char c = sDateTime.charAt(iDotPosition);
        if (c == '.') {
            // if datetime has milliseconds, separate them
            int eoms = iDotPosition + 1;
            while (Character.isDigit(sDateTime.charAt(eoms))) {
                eoms += 1;
            }
            millis = sDateTime.substring(iDotPosition, eoms);
            sDateTime = sDateTime.substring(0, iDotPosition) + sDateTime.substring(eoms);
            c = sDateTime.charAt(iDotPosition);
        }
        if (c == '+' || c == '-') {
            format.setTimeZone(TimeZone.getTimeZone("GMT" + sDateTime.substring(iDotPosition)));
            sDateTime = sDateTime.substring(0, iDotPosition) + "Z";
        } else if (c != 'Z') {
            throw new ParseException("Illegal timezone specification.", iDotPosition);
        }

        result = format.parse(sDateTime);
        if (millis != null) {
            result.setTime(result.getTime() + Math.round(Float.parseFloat(millis) * ONE_SEC_IN_MILLISECS));
        }

        result = offsetDateFromGMT(result);
        return result;
    }

    /**
     * This method converts from GMT to local timezone
     * 
     * @param date
     *       date in GMT timezone
     * @return the date in local timezone
     */
    public static Date offsetDateFromGMT(final Date date) {
        // Create a calendar - it will default to the current OS timezone.
        final GregorianCalendar gc = new GregorianCalendar();

        // Calculate the total offset from GMT
        final int totalOffset = gc.get(Calendar.ZONE_OFFSET) + gc.get(Calendar.DST_OFFSET);

        // Calculate the time in GMT
        final long localTime = date.getTime() + totalOffset;

        // Create a date using the calculated GMT time
        final Date localDate = new Date(localTime);

        return localDate;
    }
}