How to Convert a Date String to a Date or Calendar Object

Convert String to Calendar Object in Java

Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy", Locale.ENGLISH);
cal.setTime(sdf.parse("Mon Mar 14 16:02:37 GMT 2011"));// all done

note: set Locale according to your environment/requirement

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See Also

• Javadoc

How to convert a date String to a Date or Calendar object?

In brief:

DateFormat formatter = new SimpleDateFormat("MM/dd/yy");
try {
  Date date = formatter.parse("01/29/02");
} catch (ParseException e) {
  e.printStackTrace();
}

See SimpleDateFormat javadoc for more.

And to turn it into a Calendar, do:

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);

How to convert the following string to date or calendar object in Java?

You can use SimpleDateFormat#parse() to convert a String in a date format pattern to a Date.

String string = "2011-03-09T03:02:10.823Z";
String pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
Date date = new SimpleDateFormat(pattern).parse(string);
System.out.println(date); // Wed Mar 09 03:02:10 BOT 2011

For an overview of all pattern characters, read the introductory text of SimpleDateFormat javadoc.

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To convert it further to Calendar, just use Calendar#setTime().

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
// ...

Converting a Date object to a calendar object

Here's your method:

public static Calendar toCalendar(Date date){ 
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);
  return cal;
}

Everything else you are doing is both wrong and unnecessary.

BTW, Java Naming conventions suggest that method names start with a lower case letter, so it should be: dateToCalendar or toCalendar (as shown).

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OK, let's milk your code, shall we?

DateFormat formatter = new SimpleDateFormat("yyyyMMdd");
date = (Date)formatter.parse(date.toString()); 

DateFormat is used to convert Strings to Dates (parse()) or Dates to Strings (format()). You are using it to parse the String representation of a Date back to a Date. This can't be right, can it?

How to convert a String to a Calendar object?

Change your data model to use a Date. This is the usual type to be stored in the database.

You can set the Date to a Calendar by using

Calendar c = Calendar.getInstance();
c.setTime(date);

To retrieve the Date from a Calendar you can use

date = c.getTime();

Using a String to store a Date in a database needs formatting and parsing of the Strings and also no comparision iside the database can be done.

converting String to Calendar. What is the easiest way?

DateFormat df = new SimpleDateFormat("dd.MM.yyyy");
Calendar cal  = Calendar.getInstance();
cal.setTime(df.parse(stringInstanceRepresentingDate));

changing string to Calendar object value.

You should use a date format to parse your string

String dateStr = "2014-09-11";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
DateTime date = format.parse(dateStr);
Calendar cal = Calendar.getInstance();
cal.setTime(date);

How to place a date-time string into a Calendar object?

    String dateString=new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").parse("2012-08-02 12:04:03");
            Calender cal = Calender.getInstance();
            cal.setTime(new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(dateString).getTime());

wrap it around try catch though as the parse method would throw ParseException. and study the link provided by @user714965

I wanted to convert this string into calendar object of the specific date, but all it does is giving me the current date

I just ran this code and works fine for me. startDate.getTime() returns Tue Aug 01 15:18:01 PDT 2017, which is as expected.
Only thing is you're missing a semicolon at the end of line startDateDate = dateFormat.parse(startDateStr).

This might also help you: Set the Calendar to a specific date

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