diff --git a/src/Notes-master/src/net/micode/notes/ui/DateTimePickerDialog.java b/src/Notes-master/src/net/micode/notes/ui/DateTimePickerDialog.java
index 1705583..b99ed29 100644
--- a/src/Notes-master/src/net/micode/notes/ui/DateTimePickerDialog.java
+++ b/src/Notes-master/src/net/micode/notes/ui/DateTimePickerDialog.java
@@ -41,27 +41,28 @@ public class DateTimePickerDialog extends AlertDialog implements OnClickListener
     }
 
     public DateTimePickerDialog(Context context, long date) {
-        super(context);
-        mDateTimePicker = new DateTimePicker(context);
-        setView(mDateTimePicker);
+        super(context); // 调用父类的构造方法
+        mDateTimePicker = new DateTimePicker(context); // 创建一个DateTimePicker对象
+        setView(mDateTimePicker); // 设置对话框的视图为DateTimePicker对象
         mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
             public void onDateTimeChanged(DateTimePicker view, int year, int month,
-                    int dayOfMonth, int hourOfDay, int minute) {
-                mDate.set(Calendar.YEAR, year);
-                mDate.set(Calendar.MONTH, month);
-                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
-                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
-                mDate.set(Calendar.MINUTE, minute);
-                updateTitle(mDate.getTimeInMillis());
+                                          int dayOfMonth, int hourOfDay, int minute) {
+                mDate.set(Calendar.YEAR, year); // 设置日期对象的年份
+                mDate.set(Calendar.MONTH, month); // 设置日期对象的月份
+                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth); // 设置日期对象的日
+                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); // 设置日期对象的小时
+                mDate.set(Calendar.MINUTE, minute); // 设置日期对象的分钟
+                updateTitle(mDate.getTimeInMillis()); // 更新对话框的标题
             }
         });
-        mDate.setTimeInMillis(date);
-        mDate.set(Calendar.SECOND, 0);
-        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis());
-        setButton(context.getString(R.string.datetime_dialog_ok), this);
-        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null);
-        set24HourView(DateFormat.is24HourFormat(this.getContext()));
-        updateTitle(mDate.getTimeInMillis());
+
+        mDate.setTimeInMillis(date); // 将传入的日期设置给日期对象mDate
+        mDate.set(Calendar.SECOND, 0); // 将日期对象的秒设置为0
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); // 将日期对象的时间设置给DateTimePicker控件
+        setButton(context.getString(R.string.datetime_dialog_ok), this); // 设置对话框的“确定”按钮，并设置点击监听器为当前对象
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); // 设置对话框的“取消”按钮，不设置点击监听器
+        set24HourView(DateFormat.is24HourFormat(this.getContext())); // 根据系统设置判断是否为24小时制，并设置给日期时间选择器控件
+        updateTitle(mDate.getTimeInMillis()); // 更新对话框的标题，将日期对象的时间设置为标题显示
     }
 
     public void set24HourView(boolean is24HourView) {