编辑代码

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

class Main {
	public static void main(String[] args) {
        //JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。
		System.out.println("东二区：" + getFormatedDateString(2));
        long timeMillis = new Date().getTime();
        System.out.println("东八区：" + timeMillis);
        System.out.println(new Date(timeMillis));
        long timeMillis2= timeMillis+32400000;
        System.out.println(timeMillis2);
        TimeZone zt = TimeZone.getTimeZone("GMT+2:00");
        //TimeZone zt = TimeZone.getTimeZone("GMT+8:00");
        System.out.println(TimeUtil.isSameDayOfMillis(timeMillis,timeMillis2,zt));

        // Java:
long t =  System.currentTimeMillis();
System.out.println("long = " + t);
 
// current time zone:
SimpleDateFormat sdf_default = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(sdf_default.format(t));
 
// +8:00 time zone:
SimpleDateFormat sdf_8 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf_8.setTimeZone(TimeZone.getTimeZone("GMT+8:00"));
System.out.println("GMT+8:00 = " + sdf_8.format(t));
 
// +7:00 time zone:
SimpleDateFormat sdf_2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf_2.setTimeZone(TimeZone.getTimeZone("GMT+2:00"));
System.out.println("GMT+2:00 = " + sdf_2.format(t));
 
// -9:00 time zone:
SimpleDateFormat sdf_la = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf_la.setTimeZone(TimeZone.getTimeZone("America/Los_Angeles"));
System.out.println("America/Los_Angeles = " + sdf_la.format(t));
	}

    public static String getUTCWAST2(){
        return getFormatedDateString(2);
    }

    public static Date getUTCWAST2Date() {
        String utc2Date = getUTCWAST2();
        Date date = null;
        try {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            date= sdf.parse(utc2Date);
        } catch (Exception e) {
        }
        return date;
    }

        public static String getFormatedDateString(float timeZoneOffset){
        if (timeZoneOffset > 13 || timeZoneOffset < -12) {
            timeZoneOffset = 0;
        }

        int newTime=(int)(timeZoneOffset * 60 * 60 * 1000);
        TimeZone timeZone;
        String[] ids = TimeZone.getAvailableIDs(newTime);
        if (ids.length == 0) {
            timeZone = TimeZone.getDefault();
        } else {
            timeZone = new SimpleTimeZone(newTime, ids[0]);
        }

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        sdf.setTimeZone(timeZone);
        return sdf.format(new Date());
    }
}

class TimeUtil {
  
    public static final int SECONDS_IN_DAY = 60 * 60 * 24;
    public static final long MILLIS_IN_DAY = 1000L * SECONDS_IN_DAY;
  
    public static boolean isSameDayOfMillis(final long ms1, final long ms2,TimeZone tz) {
        final long interval = ms1 - ms2;
        return interval < MILLIS_IN_DAY
                && interval > -1L * MILLIS_IN_DAY
                && toDay(ms1,tz) == toDay(ms2,tz);
    }
  
    private static long toDay(long millis,TimeZone tz) {
        //System.out.println(TimeZone.getDefault());
        //return (millis + TimeZone.getDefault().getOffset(millis)) / MILLIS_IN_DAY;
        //return (millis + TimeZone.getTimeZone("GMT+2:00").getOffset(millis)) / MILLIS_IN_DAY;
        return (millis + tz.getOffset(millis)) / MILLIS_IN_DAY;
    }
}