java时间转换，带时区的

我假设了你的已知时间类型为Calendar，如果不是你也可以自己改成Date类型，代码如下：

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import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.TimeZone;

public class Test {

public static void main(String[] args) {

//假如这个是你已知的时间类型

Calendar cal = Calendar.getInstance();

cal.getTimeInMillis();

//北京时区GMT+8

Calendar beijingcal = Calendar.getInstance();

beijingcal.clear();

beijingcal.setTimeZone(TimeZone.getTimeZone("GMT+8"));

beijingcal.setTimeInMillis(cal.getTimeInMillis());

DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String beijingFormatStr = fmt.format(beijingcal.getTime());

System.out.println(beijingFormatStr);

}

}

java 时区转换

public Date getCST(String strGMT) throws ParseException {

DateFormat df = new SimpleDateFormat("EEE, d-MMM-yyyy HH:mm:ss z", Locale.ENGLISH);

return df.parse(strGMT);

}

public String getGMT(Date dateCST) {

DateFormat df = new SimpleDateFormat("EEE, d-MMM-yyyy HH:mm:ss z", Locale.ENGLISH);

df.setTimeZone(TimeZone.getTimeZone("GMT")); // modify Time Zone.

return(df.format(dateCST));

}

2种方法仅供参考，希望 采纳。

关于JAVA时间格式转换问题，涉及时区

//我实现一个时钟窗口程序给你了，好让你更容易理解，希望对你有帮助。 import java.awt.*; import java.awt.event.*; import java.util.*; //世界时钟 public class TimerTest { public static void main(String[] args) { new TimerTestFrame("世界时钟"); } } class TimerTestFrame extends Frame { /** * */ private static final long serialVersionUID = 1L; public TimerTestFrame(String s) { super(s); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { dispose(); System.exit(0); } }); setLayout(new GridLayout(2, 6)); ClockCanvas clk1 = new ClockCanvas("北京", "GMT+8"); // 创建时钟 ClockCanvas clk2 = new ClockCanvas("巴黎", "GMT+2"); ClockCanvas clk3 = new ClockCanvas("华盛顿", "GMT-4"); ClockCanvas clk4 = new ClockCanvas("洛衫矶", "GMT-7"); ClockCanvas clk5 = new ClockCanvas("伦敦", "GMT+1"); ClockCanvas clk6 = new ClockCanvas("芝加哥", "GMT-5"); add(clk1); add(clk2); add(clk3); add(clk4); add(clk5); add(clk6); setSize(500, 350); // 设置框架宽高 setVisible(true); } } class ClockCanvas extends Canvas implements Runnable { /** * */ private static final long serialVersionUID = 1L; private int seconds = 0; private String city; private GregorianCalendar calendar; Thread t; public ClockCanvas(String c, String tz) { city = c; //也可以通过TimeZone.setTimeZone(String n)函数改变时区，n为时区参数名。 calendar = new GregorianCalendar(TimeZone.getTimeZone(tz)); t = new Thread(this); t.start(); setSize(125, 125); // 设置画布大小 setBackground(Color.black); } // 重写父类的方法绘制时钟图形 public void paint(Graphics g) { Graphics2D g2d = (Graphics2D) g; BasicStroke bstroke = new BasicStroke(2.0f); g2d.setStroke(bstroke); g2d.setColor(Color.green); g2d.drawOval(0, 0, 100, 100); bstroke = new BasicStroke(5.0f); g2d.setStroke(bstroke); g2d.drawLine(50, 0, 50, 5); g2d.drawLine(0, 50, 5, 50); g2d.drawLine(50, 95, 50, 98); g2d.drawLine(95, 50, 98, 50); double hourAngle = 2 * Math.PI * (seconds - 3 * 60 * 60) / (12 * 60 * 60); double minuteAngle = 2 * Math.PI * (seconds - 15 * 60) / (60 * 60); double secondAngle = 2 * Math.PI * (seconds - 15) / (60); bstroke = new BasicStroke(5.0f); g2d.setStroke(bstroke); g2d.drawLine(50, 50, 50 + (int) (30 * Math.cos(hourAngle)), 50 + (int) (30 * Math.sin(hourAngle))); bstroke = new BasicStroke(3.0f); g2d.setStroke(bstroke); g2d.drawLine(50, 50, 50 + (int) (40 * Math.cos(minuteAngle)), 50 + (int) (40 * Math.sin(minuteAngle))); bstroke = new BasicStroke(1.0f); g2d.setStroke(bstroke); g2d.drawLine(50, 50, 50 + (int) (45 * Math.cos(secondAngle)), 50 + (int) (45 * Math.sin(secondAngle))); g2d.setColor(Color.red); g2d.drawString(city, 35, 115); } public void timeElapsed() { //new Date()获得当前时间 System.out.println(new Date()); calendar.setTime(new Date()); seconds = calendar.get(Calendar.HOUR) * 60 * 60 + calendar.get(Calendar.MINUTE) * 60 + calendar.get(Calendar.SECOND); } public void run() { try { while (true) { Thread.sleep(300); timeElapsed(); repaint(); } } catch (InterruptedException e) { } } }

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