Java TimeZone Get getDefaultTimeZoneOffset()

Description

Get the offset between GMT and the local timezone

License

Open Source License

Return

the offset

Declaration

public static long getDefaultTimeZoneOffset() 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class Main {
    public static final long SECOND_FACTOR = 1000;
    public static final long MINUTE_FACTOR = 60 * SECOND_FACTOR;
    public static final long HOUR_FACTOR = 60 * MINUTE_FACTOR;

    /**/* ww  w .  j a v  a2 s .c  o  m*/
     * Get the offset between GMT and the local timezone
     * @return the offset
     */
    public static long getDefaultTimeZoneOffset() {
        long offset = 0;
        TimeZone zn = TimeZone.getDefault();
        Calendar local = Calendar.getInstance();
        local.setTime(new Date(System.currentTimeMillis()));

        // the offset to add to GMT to get local time, modified in case of
        // daylight savings
        int time = (int) (local.get(Calendar.HOUR_OF_DAY) * HOUR_FACTOR + local.get(Calendar.MINUTE) * MINUTE_FACTOR
                + local.get(Calendar.SECOND) * SECOND_FACTOR);
        offset = zn.getOffset(1, // era AD
                local.get(Calendar.YEAR), local.get(Calendar.MONTH), local.get(Calendar.DAY_OF_MONTH),
                local.get(Calendar.DAY_OF_WEEK), time);
        return offset;
    }
}

Related

1. getConvertDateString(Date date, TimeZone tz, String fmt)
2. getCurrentCalendarInTimeZone(final TimeZone timeZone)
3. getCurrentTimeZone()
4. getCurrentTimezoneOffset()
5. getDateInTimeZone(final Date date, final TimeZone timeZone)
6. getDefaultTimeZoneRawOffset()
7. getDefaultTimeZoneString()
8. getDiffTimeZoneRawOffset(String timeZoneId)
9. getDisplayDate(Date date, TimeZone tz, Locale inLocale, int style, boolean includeTime)