diff --git a/src/Notes-master/src/net/micode/notes/ui/DateTimePicker.java b/src/Notes-master/src/net/micode/notes/ui/DateTimePicker.java
index 2ee515f..141f670 100644
--- a/src/Notes-master/src/net/micode/notes/ui/DateTimePicker.java
+++ b/src/Notes-master/src/net/micode/notes/ui/DateTimePicker.java
@@ -79,8 +79,11 @@ public class DateTimePicker extends FrameLayout {
     private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 计算日期差值并更新日期
             mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            // 更新日期选择器控件
             updateDateControl();
+            // 触发日期时间变化监听器
             onDateTimeChanged();
         }
     };
@@ -91,6 +94,7 @@ public class DateTimePicker extends FrameLayout {
             boolean isDateChanged = false;
             Calendar cal = Calendar.getInstance();
             if (!mIs24HourView) {
+                // 处理上午/下午切换时的日期变化
                 if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, 1);
@@ -100,12 +104,14 @@ public class DateTimePicker extends FrameLayout {
                     cal.add(Calendar.DAY_OF_YEAR, -1);
                     isDateChanged = true;
                 }
+                // 处理上午/下午切换时的上午/下午选择器更新
                 if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
                         oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
                     mIsAm = !mIsAm;
                     updateAmPmControl();
                 }
             } else {
+                // 处理24小时制下的日期变化
                 if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
                     cal.setTimeInMillis(mDate.getTimeInMillis());
                     cal.add(Calendar.DAY_OF_YEAR, 1);
@@ -116,9 +122,11 @@ public class DateTimePicker extends FrameLayout {
                     isDateChanged = true;
                 }
             }
+            // 更新小时，并触发日期时间变化监听器
             int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
             mDate.set(Calendar.HOUR_OF_DAY, newHour);
             onDateTimeChanged();
+            // 如果日期发生了变化，更新年、月、日
             if (isDateChanged) {
                 setCurrentYear(cal.get(Calendar.YEAR));
                 setCurrentMonth(cal.get(Calendar.MONTH));
@@ -126,7 +134,6 @@ public class DateTimePicker extends FrameLayout {
             }
         }
     };
-
     private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
         @Override
         public void onValueChange(NumberPicker picker, int oldVal, int newVal) {