将字符串解析为日期格式

Question

I am importing data from a csv file via opencsv to insert into a mysql DB. opencsv imports as string and for 1 field in the DB I need to parse it to date in the format: yyyy-MM-dd. However I am getting an error.

// This is the string that I have extracted from the csv file           
String elem1 = nextLine[0];

// printing out to console I can see the string I wish to convert
System.out.println(elem1); => 2015-08-14

// Below is my code to parse the date

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date convertedCurrentDate = sdf.parse(elem1);
String date=sdf.format(convertedCurrentDate );

// printing date to console gives me 2015-08-14
System.out.println(date);

As mentioned above printing date out to console gives me 2015-08-14. However I get the error:

java.text.ParseException: Unparseable date: "" 

Can someone give me some advice as to what I am doing wrong?

The line 'java.util.Date convertedCurrentDate = sdf.parse(elem1);' is the line causing the error.

Thanks!

Answer 1

I am stumped also the following test passes on my machine

public class DateFormatterTest {

private static final String TEST_DATE = "2015-08-14";

   @Test
   public void SimpleDateFormatTest() throws ParseException {
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
      java.util.Date convertedCurrentDate = sdf.parse(TEST_DATE);
      String date=sdf.format(convertedCurrentDate );
      assertEquals(TEST_DATE, date);
   } 

}

What version of Java are you running? I know there was an issue in the latest java 8 (8u61) and JodaTime.

Also try the test above that eliminates everything but the Date code.

Answer 2

Here is the Simple Example to do that :

SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
String dateInString = "7-Jun-2013";
try {
    Date date = formatter.parse(dateInString);
    System.out.println(date);
    System.out.println(formatter.format(date));
} catch (ParseException e) {
    e.printStackTrace();
}

Java 8 update

String string = "August 21, 2015";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM d, yyyy", Locale.ENGLISH);
LocalDate date = LocalDate.parse(string, formatter);
System.out.println(date); // 2015-09-21

i think this is what you want .Happy to help thanks