Java 儒略日期转换
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Julian Date Conversion
提问by Milli Szabo
Sample Julian Dates:
2009218
2009225
2009243
How do I convert them into a regular date?
如何将它们转换为常规日期？
I tried converting them using online converterand I got-
我尝试使用在线转换器转换它们，我得到了-
12-13-7359 for 2009225!! Makes no sense!
12-13-7359 为 2009225！！没有意义！
采纳答案by Mike Sickler
Use the Joda-Timelibrary and do something like this:
使用Joda-Time库并执行以下操作：
String dateStr = "2009218";
MutableDateTime mdt = new MutableDateTime();
mdt.setYear(Integer.parseInt(dateStr.subString(0,3)));
mdt.setDayOfYear(Integer.parseInt(dateStr.subString(4)));
Date parsedDate = mdt.toDate();
Using the Java API:
使用 Java API：
String dateStr = "2009218";
Calendar cal = new GregorianCalendar();
cal.set(Calendar.YEAR,Integer.parseInt(dateStr.subString(0,3)));
cal.set(Calendar.DAY_OF_YEAR,Integer.parseInt(dateStr.subString(4)));
Date parsedDate = cal.getTime();
---- EDIT ---- Thanks for Alex for providing the best answer:
---- 编辑---- 感谢亚历克斯提供最佳答案：
Date myDate = new SimpleDateFormat("yyyyD").parse("2009218")
回答by gishac
Another format is CYYDDDD I wrote this function in Java
另一种格式是 CYYDDDD 我用 Java 写了这个函数
public static int convertToJulian(Date date){
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int year = calendar.get(Calendar.YEAR);
String syear = String.format("%04d",year).substring(2);
int century = Integer.parseInt(String.valueOf(((year / 100)+1)).substring(1));
int julian = Integer.parseInt(String.format("%d%s%03d",century,syear,calendar.get(Calendar.DAY_OF_YEAR)));
return julian;
}
