package ch.makery.address.util; import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar; /**
* Helper functions for handling dates.
*/
public class CalendarUtil { /**
* Default date format in the form 2013-03-18.
*/
private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd"); /**
* Returns the given date as a well formatted string. The above defined date
* format is used.
*
* @param calendar date to be returned as a string
* @return formatted string
*/
public static String format(Calendar calendar) {
if (calendar == null) {
return null;
}
return DATE_FORMAT.format(calendar.getTime());
} /**
* Converts a String in the format "yyyy-MM-dd" to a Calendar object.
*
* Returns null if the String could not be converted.
*
* @param dateString the date as String
* @return the calendar object or null if it could not be converted
*/
public static Calendar parse(String dateString) {
Calendar result = Calendar.getInstance();
try {
result.setTime(DATE_FORMAT.parse(dateString));
return result;
} catch (ParseException e) {
return null;
}
} /**
* Checks the String whether it is a valid date.
*
* @param dateString
* @return true if the String is a valid date
*/
public static boolean validString(String dateString) {
try {
DATE_FORMAT.parse(dateString);
return true;
} catch (ParseException e) {
return false;
}
}
}