如何在java中将mm/dd/yyyy转换为yyyy-mm-dd
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how to convert mm/dd/yyyy to yyyy-mm-dd in java
提问by Ankit Jain
i am getting input date as String into mm/dd/yyyy and want to convert it into yyyy-mm-dd i try out this code
我正在将输入日期作为字符串输入 mm/dd/yyyy 并想将其转换为 yyyy-mm-dd 我试试这个代码
Date Dob = new SimpleDateFormat("yyyy-mm-dd").parse(request.getParameter("dtDOB"));
回答by Bohemian
OK - you've fallen for one of the most common traps with java date formats:
好的 - 您已经陷入了 Java 日期格式最常见的陷阱之一：
mmis minutesMMis months
mm是分钟MM是几个月
You have parsed months as minutes. Instead, change the pattern to:
您已将月份解析为分钟。相反，将模式更改为：
Date dob = new SimpleDateFormat("yyyy-MM-dd").parse(...);
Then to output, again make sure you use MMfor months.
然后要输出，再次确保你用MM了几个月。
String str = new SimpleDateFormat("dd-MM-yyyy").format(dob);
回答by Kamlesh Arya
It should be
它应该是
SimpleDateFormat("yyyy-MM-dd")
capital M
大写M
For More info refer Oracle Docs
有关更多信息，请参阅 Oracle 文档
回答by Evgeniy Dorofeev
As alternative to parsing you can use regex
作为解析的替代方法，您可以使用正则表达式
s = s.replaceAll("(\d+)/(\d+)/(\d+)", "--");
回答by Rahul
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class FormatDate {
private SimpleDateFormat inSDF = new SimpleDateFormat("mm/dd/yyyy");
private SimpleDateFormat outSDF = new SimpleDateFormat("yyyy-mm-dd");
public String formatDate(String inDate) {
String outDate = "";
if (inDate != null) {
try {
Date date = inSDF.parse(inDate);
outDate = outSDF.format(date);
} catch (ParseException ex)
System.out.println("Unable to format date: " + inDate + e.getMessage());
e.printStackTrace();
}
}
return outDate;
}
public static void main(String[] args) {
FormatDate fd = new FormatDate();
System.out.println(fd.formatDate("12/10/2013"));
}
}
回答by Arjit
Ex -
前任 -
String dob = "05/02/1989"; //its in MM/dd/yyyy
String newDate = null;
Date dtDob = new Date(dob);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
try {
newDate = sdf.format(dtDob);
} catch (ParseException e) {}
System.out.println(newDate); //Output is 1989-05-02
