Java 时区之间时间转换
1 SimpleDateFormat foo = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 2 System.out.println("foo:" + foo.format(new Date())); 3 4 Calendar gc = GregorianCalendar.getInstance(); 5 System.out.println("gc.getTime():" + gc.getTime()); 6 System.out.println("gc.getTimeInMillis():" + new Date(gc.getTimeInMillis())); 7 8 // 当前系统默认时区的时间: 9 Calendar calendar = new GregorianCalendar(); 10 System.out.print("时区:" + calendar.getTimeZone().getID() + " "); 11 System.out.println("时间:" + calendar.get(Calendar.HOUR_OF_DAY) + ":" + calendar.get(Calendar.MINUTE)); 12 // 美国洛杉矶时区 13 TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); 14 // 时区转换 15 calendar.setTimeZone(tz); 16 System.out.print("时区:" + calendar.getTimeZone().getID() + " "); 17 System.out.println("时间:" + calendar.get(Calendar.HOUR_OF_DAY) + ":" + calendar.get(Calendar.MINUTE)); 18 Date time = new Date(); 19 20 // 1、取得本地时间: 21 java.util.Calendar cal = java.util.Calendar.getInstance(); 22 23 // 2、取得时间偏移量: 24 int zoneOffset = cal.get(java.util.Calendar.ZONE_OFFSET); 25 26 // 3、取得夏令时差: 27 int dstOffset = cal.get(java.util.Calendar.DST_OFFSET); 28 29 // 4、从本地时间里扣除这些差量,即可以取得UTC时间: 30 cal.add(java.util.Calendar.MILLISECOND, -(zoneOffset + dstOffset)); 31 32 // 之后调用cal.get(int x)或cal.getTimeInMillis()方法所取得的时间即是UTC标准时间。 33 System.out.println("UTC:" + new Date(cal.getTimeInMillis())); 34 35 Calendar calendar1 = Calendar.getInstance(); 36 TimeZone tztz = TimeZone.getTimeZone("GMT"); 37 calendar1.setTimeZone(tztz); 38 System.out.println(calendar.getTime()); 39 System.out.println(calendar.getTimeInMillis()); 40 41 // SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd‘T‘HH:mm:ss‘Z‘"); 42 // df.setTimeZone(TimeZone.getTimeZone("UTC")); 43 // System.out.println(df.parse("2014-08-23T09:20:05Z").toString()); 44 45 SimpleDateFormat df1 = new SimpleDateFormat("yyyy-MM-dd‘T‘HH:mm:ss.SSS‘Z‘"); 46 Date t = new Date(); 47 System.out.println(df1.format(t)); 48 System.out.println(df1.format(df1.parse("2014-08-27T18:02:59.676Z")) + "***********"); 49 df1.setTimeZone(TimeZone.getTimeZone("UTC")); 50 System.out.println(df1.format(t)); 51 System.out.println("-----------"); 52 System.out.println(df1.format(df1.parse("2014-08-27T18:02:59.676Z")) + "***********"); 53 System.out.println("2014-08-27T18:02:59.676Z");
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