android DatePickerDialog ช่วยดูหน่อยมันขึ้นแต่ค่าแรก พอจะสร้างอีกตัวมันกลับไปทับค่าแรก

import java.util.Calendar;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ImageView;

	public class ConcludeTime extends Activity {
		// ตัวแปละtime
		private EditText editT123;
		private EditText editT124;
		private ImageView btn123;
		private ImageView btn124;

		private int mYear;
		private int mMonth;
		private int mDay;
		static final int DATE_DIALOG_ID = 0;
		
		private int mYear2;
		private int mMonth2;
		private int mDay2;
		static final int DATE_DIALOG_ID2 = 0;

		@Override
		protected void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			setContentView(R.layout.concludetime);
			
			editT123 = (EditText) findViewById(R.id.edtday123);
			
			final Calendar c = Calendar.getInstance();
		    mYear = c.get(Calendar.YEAR);
			mMonth = c.get(Calendar.MONTH);
			mDay = c.get(Calendar.DAY_OF_MONTH);
			
			updateCurrentDate();
			
			editT124 = (EditText) findViewById(R.id.edtday124);
			
			final Calendar e = Calendar.getInstance();
			mYear2 = e.get(Calendar.YEAR);
			mMonth2 = e.get(Calendar.MONTH);
			mDay2 = e.get(Calendar.DAY_OF_MONTH);
			
			updateCurrentDate2();
			
			
			// เวลาเริ่ม ************
			
			

			btn123 = (ImageView) findViewById(R.id.btnday123);
			btn123.setOnClickListener(new View.OnClickListener() {
				public void onClick(View v) {
					showDialog(DATE_DIALOG_ID);
				}
			});	
			
			
		// ##สิ้นสุด*********************##
			
			
			
			btn124 = (ImageView) findViewById(R.id.btnday124);
			btn124.setOnClickListener(new View.OnClickListener() {
				public void onClick(View v) {
					showDialog(DATE_DIALOG_ID2);
				}
			});
			
			
			final ImageView btnback = (ImageView) findViewById(R.id.btnback);
			btnback.setOnClickListener(new View.OnClickListener() {
	            public void onClick(View v) {
	            	
	                    	Intent newActivity = new Intent(ConcludeTime.this,Conclude.class);
	                    	startActivity(newActivity);
	                    	
	                    }
	        		});
	            		            	
    }
		
		//เริ่ม เวลาเรียกใช้ ************
				protected Dialog onCreateDialog(int id) {
					switch (id) {
					case DATE_DIALOG_ID:
						return new DatePickerDialog(this, mDateSetListener, mYear, mMonth,
								mDay);
						//break;										
					}
				  switch (id) {	
				  case DATE_DIALOG_ID2:
					   return new DatePickerDialog(this, mDateSetListener2, mYear2, mMonth2,
							mDay2);
				 }
					return null;
				}

				// updates the date we display in the editText
				private void updateCurrentDate() {
					editT123.setText(new StringBuilder()
							// Month is 0 based so add 1
							.append(mDay).append("-").append(mMonth + 1).append("-")
							.append(mYear).append(" "));
					
				}

				private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {

					public void onDateSet(DatePicker view, int year, int monthOfYear,
							int dayOfMonth) {
						mYear = year;
						mMonth = monthOfYear;
						mDay = dayOfMonth;
						updateCurrentDate();
					}
				};
	
		//สิ้นสุด เวลาเรียกใช้ ************

				// updates the date we display in the editText
				private void updateCurrentDate2() {					
					editT124.setText(new StringBuilder()
					// Month is 0 based so add 1
					.append(mDay2).append("-").append(mMonth2 + 1).append("-")
					.append(mYear2).append(" "));
				}

				private DatePickerDialog.OnDateSetListener mDateSetListener2 = new DatePickerDialog.OnDateSetListener() {

					public void onDateSet(DatePicker view, int year2, int monthOfYear2,
							int dayOfMonth2) {
						mYear2 = year2;
						mMonth2 = monthOfYear2;
						mDay2 = dayOfMonth2;
						updateCurrentDate2();
					}
				};
	}