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I followed the codes here to set the colors of a specific date in Toedter's Calendar. The problem I am facing now is that it is not highlighting the correct cell. In my example I have used 14th and 15th of June but it highlighted 8th and 9th.

And heres my code:

DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");

 Date sdate= null;
 String d = null;
 for(int i =0;i<pd.size();i++)
 d = pd.get(i).getDate();
 try

 sdate = (Date)formatter.parse(d); 
 if(events.contains(sdate))

 
 else
 events.add(sdate);
 System.out.println(sdate);
 

 catch(ParseException r)
 System.out.println("error");
 

 

 //arraylist of events
 for(int i = 0; i < events.size(); i++)
 
 Calendar cal1 = Calendar.getInstance();
 cal1.setTime(events.get(i));
 int day1 = cal1.get(Calendar.DAY_OF_MONTH);
 int month1 = cal1.get(Calendar.MONTH);
 int year1 = cal1.get(Calendar.YEAR);
 //selected month and year on JCalendar
 if(month == month1 && year == year1)
 
 // Calculate the offset of the first day of the month
 cal.set(Calendar.DAY_OF_MONTH,1);
 int offset = cal.get(Calendar.DAY_OF_WEEK) -1;
 component[day1 + offset ].setBackground(Color.blue); 
 
 

As an alternative to changing the components, implement IDateEvaluator and return the desired colors, as suggested here. It's not clear where your Calendar offset goes awry. The example below uses List::contains to identify special dates. Just be sure to clear the time fields on the calendar dates you add().

import com.toedter.calendar.IDateEvaluator;
import com.toedter.calendar.JCalendar;
import java.awt.Color;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.swing.JFrame;

/**
 * @see https://stackoverflow.com/a/37899883/230513
 * @see https://stackoverflow.com/q/25501373/230513
 */
public class HighlightTest 

 private static class HighlightEvaluator implements IDateEvaluator 

 private final List<Date> list = new ArrayList<>();

 public void add(Date date) 
 list.add(date);
 

 @Override
 public boolean isSpecial(Date date) 
 return list.contains(date);
 

 @Override
 public Color getSpecialForegroundColor() 
 return Color.red.darker();
 

 @Override
 public Color getSpecialBackroundColor() 
 return Color.blue;
 

 @Override
 public String getSpecialTooltip() 
 return "Highlighted event.";
 

 @Override
 public boolean isInvalid(Date date) 
 return false;
 

 @Override
 public Color getInvalidForegroundColor() 
 return null;
 

 @Override
 public Color getInvalidBackroundColor() 
 return null;
 

 @Override
 public String getInvalidTooltip() 
 return null;
 
 

 private void display() 
 JFrame f = new JFrame("Highlight Test");
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 HighlightEvaluator evaluator = new HighlightEvaluator();
 evaluator.add(createDate(14));
 evaluator.add(createDate(15));
 JCalendar jc = new JCalendar();
 jc.getDayChooser().addDateEvaluator(evaluator);
 jc.setCalendar(jc.getCalendar());
 f.add(jc);
 f.pack();
 f.setLocationRelativeTo(null);
 f.setVisible(true);
 

 private Date createDate(int d) 
 Calendar c = Calendar.getInstance();
 c.set(Calendar.DAY_OF_MONTH, d);
 c.set(Calendar.HOUR_OF_DAY, 0);
 c.set(Calendar.MINUTE, 0);
 c.set(Calendar.SECOND, 0);
 c.set(Calendar.MILLISECOND, 0);
 return (c.getTime());
 

 public static void main(String args) 
 EventQueue.invokeLater(new HighlightTest()::display);