[英]How to convert Date/Time from Long(millisecodns) to RFC-822 format in Java
我有毫秒的时间,我需要将其转换为RFC-822格式。 我可以使用通用的Java库吗? 最佳做法是什么?
示例时间(以毫秒为单位): 1440612000000 RFC-822中的时间: 2002年10月2日,星期三,美国东部标准时间
提前致谢。
您可以使用Java中包含的日历类:
Calendar calendar = Calendar.getInstance();
// set time in millis
calender.setTimeInMillis(millis);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH); // Jan = 0, dec = 11
int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
int weekOfYear = calendar.get(Calendar.WEEK_OF_YEAR);
int weekOfMonth= calendar.get(Calendar.WEEK_OF_MONTH);
int hour = calendar.get(Calendar.HOUR); // 12 hour clock
int hourOfDay = calendar.get(Calendar.HOUR_OF_DAY); // 24 hour clock
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);
int millisecond= calendar.get(Calendar.MILLISECOND);
System.out.println(sdf.format(calendar.getTime()));
System.out.println("year \t\t: " + year);
System.out.println("month \t\t: " + month);
System.out.println("dayOfMonth \t: " + dayOfMonth);
System.out.println("dayOfWeek \t: " + dayOfWeek);
System.out.println("weekOfYear \t: " + weekOfYear);
System.out.println("weekOfMonth \t: " + weekOfMonth);
System.out.println("hour \t\t: " + hour);
System.out.println("hourOfDay \t: " + hourOfDay);
System.out.println("minute \t\t: " + minute);
System.out.println("second \t\t: " + second);
System.out.println("millisecond \t: " + millisecond);
然后,您可以仅根据值构建字符串。 例如:
String s = calender.getDisplayName(Calender.DAY_OF_WEEK, Calender.SHORT, locale) + ", " + calender.get(Calender.DAY_OF_MONTH) + " " + calender.getDisplayName(Calender.MONTH, Calender.SHORT, locale) + " " + calender.get(Calender.YEAR);
将打印: Wed, 02 Oct 2002
SimpleDateFormat dateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz");
dateFormat.setTimeZone(TimeZone.getTimeZone("EST")); //To use the EST time zone as in your example
dateFormat.format(new Date(timeInMiliseconds));
例如, Wed, 26 Aug 2015 13:00:00 EST
输出1440612000000L。
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