如何以自定义日期格式返回Calendar对象

Question

How to return calender object using this.

public static Calendar getDeCal(Timestamp timeStamp) {
    Calendar tempCal = new GregorianCalendar();
    tempCal.setTime(new Date(timeStamp.getTime()));
    return tempCal;
}

Its giving out put in this format without milliseconds.

2014-06-25T21:34:04+05:30

But we need in this format with milliseconds

2014-06-25T21:34:04 .555+05:30

As per above requirement i have changed the code to this format

public static Calendar getDateCal(Timestamp timeStamp) throws ParseException {
    Calendar tempCal = new GregorianCalendar();
    SimpleDateFormat ft =  new SimpleDateFormat ("yyyy.MM.dd 'T' hh:mm:ss.SS  z");
    String date1 = ft.format(timeStamp.getTime());
    tempCal.setTime(ft.parse(date1));
    return tempCal;
}

But its giving error while running.

Any help about this.

I am getting this error while ruining in standalone application.

Exception in thread "main" java.lang.IllegalArgumentException
    at java.util.Date.parse(Unknown Source)
    at java.util.Date.<init>(Unknown Source)

Answer 1

If you want to have the Calendar object as a variable and print it, then use the SimpleDateFormat object to format it when you are ready to display the output. I did not see any way to automatically fill the time zone colon through the format characters so I used a substring to add one instead.

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss. SSSZZZ");

Calendar c = Calendar.getInstance();

String formattedTime = sdf.format(c.getTime());

int colon = formattedTime.length()-2;
formattedTime = formattedTime.substring(0,colon) + ":"
    + formattedTime.substring(colon);

System.out.println(formattedTime);

Output:2015-01-05T13:30:49. 635-06:00

EDIT: If you are looking for a single object that is a calendar and can generate output in the given format, you would have to make a new class to connect the two together. The output and the calendar object are two different things. The calendar represent the time. The output represents the human readable portion, the string.

public class PersonalCalendar extends GregorianCalendar
{
  SimpleDateFormat sdf;
  public PersonalCalendar(Timestamp timestamp)
  {
    super();
    setTime(timestamp);
    sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss. SSSZZZ");
  }

  public String toString()
  {
    String formattedTime = sdf.format(getTime());
    int colon = formattedTime.length()-2;
    formattedTime = formattedTime.substring(0,colon) + ":"+ formattedTime.substring(colon);
    return formattedTime;
  }
}

In use.

Calendar c = new PersonalCalendar(timestamp);
System.out.println(c.toString());

Output:2015-01-06T09:29:29. 783-06:00