diff --git a/Bin/SunnyUI.dll b/Bin/SunnyUI.dll
index bb334d22..b5c7601a 100644
Binary files a/Bin/SunnyUI.dll and b/Bin/SunnyUI.dll differ
diff --git a/Bin/SunnyUI.pdb b/Bin/SunnyUI.pdb
index 2c23cf05..32c7120d 100644
Binary files a/Bin/SunnyUI.pdb and b/Bin/SunnyUI.pdb differ
diff --git a/SunnyUI.Demo/Bin/SunnyUI.Demo.exe b/SunnyUI.Demo/Bin/SunnyUI.Demo.exe
index f7b47f78..9c7e11d3 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.Demo.exe and b/SunnyUI.Demo/Bin/SunnyUI.Demo.exe differ
diff --git a/SunnyUI.Demo/Bin/SunnyUI.dll b/SunnyUI.Demo/Bin/SunnyUI.dll
index bb334d22..b5c7601a 100644
Binary files a/SunnyUI.Demo/Bin/SunnyUI.dll and b/SunnyUI.Demo/Bin/SunnyUI.dll differ
diff --git a/SunnyUI.Demo/Controls/FCombobox.Designer.cs b/SunnyUI.Demo/Controls/FCombobox.Designer.cs
index 8079d6b3..116ffa4b 100644
--- a/SunnyUI.Demo/Controls/FCombobox.Designer.cs
+++ b/SunnyUI.Demo/Controls/FCombobox.Designer.cs
@@ -82,6 +82,7 @@
             this.uiDatetimePicker1.Text = "2020-06-02 17:57:28";
             this.uiDatetimePicker1.TextAlignment = System.Drawing.ContentAlignment.MiddleLeft;
             this.uiDatetimePicker1.Value = new System.DateTime(2020, 6, 2, 17, 57, 28, 203);
+            this.uiDatetimePicker1.ValueChanged += new Sunny.UI.UIDatetimePicker.OnDateTimeChanged(this.uiDatetimePicker1_ValueChanged);
             // 
             // uiColorPicker1
             // 
@@ -138,6 +139,7 @@
             this.uiTimePicker1.Text = "23:41:39";
             this.uiTimePicker1.TextAlignment = System.Drawing.ContentAlignment.MiddleLeft;
             this.uiTimePicker1.Value = new System.DateTime(2020, 5, 29, 23, 41, 39, 684);
+            this.uiTimePicker1.ValueChanged += new Sunny.UI.UITimePicker.OnDateTimeChanged(this.uiTimePicker1_ValueChanged);
             // 
             // uiLine3
             // 
@@ -178,6 +180,7 @@
             this.uiDatePicker1.Text = "2020-04-16";
             this.uiDatePicker1.TextAlignment = System.Drawing.ContentAlignment.MiddleLeft;
             this.uiDatePicker1.Value = new System.DateTime(2020, 4, 16, 0, 0, 0, 0);
+            this.uiDatePicker1.ValueChanged += new Sunny.UI.UIDatePicker.OnDateTimeChanged(this.uiDatePicker1_ValueChanged);
             // 
             // uiComboBox2
             // 
diff --git a/SunnyUI.Demo/Controls/FCombobox.cs b/SunnyUI.Demo/Controls/FCombobox.cs
index 3a405f67..e4df333c 100644
--- a/SunnyUI.Demo/Controls/FCombobox.cs
+++ b/SunnyUI.Demo/Controls/FCombobox.cs
@@ -7,9 +7,21 @@ namespace Sunny.UI.Demo
         public FCombobox()
         {
             InitializeComponent();
-            uiDatePicker1.Value = DateTime.Today;
-            uiTimePicker1.Value = DateTime.Now;
-            uiDatetimePicker1.Value = DateTime.Now;
+        }
+
+        private void uiDatePicker1_ValueChanged(object sender, DateTime value)
+        {
+            uiDatePicker1.Value.ConsoleWriteLine();
+        }
+
+        private void uiDatetimePicker1_ValueChanged(object sender, DateTime value)
+        {
+            uiDatetimePicker1.Value.ConsoleWriteLine();
+        }
+
+        private void uiTimePicker1_ValueChanged(object sender, DateTime value)
+        {
+            uiTimePicker1.Value.ConsoleWriteLine();
         }
     }
 }
diff --git a/SunnyUI/Controls/DropItem/UITimeItem.cs b/SunnyUI/Controls/DropItem/UITimeItem.cs
index 593aac05..14365c1e 100644
--- a/SunnyUI/Controls/DropItem/UITimeItem.cs
+++ b/SunnyUI/Controls/DropItem/UITimeItem.cs
@@ -547,7 +547,7 @@ namespace Sunny.UI
 
         private void btnOK_Click(object sender, EventArgs e)
         {
-            time = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, Hour, Minute, Second);
+            time = new DateTime(DateTime.MinValue.Year, DateTime.MinValue.Month, DateTime.MinValue.Day, Hour, Minute, Second);
             DoValueChanged(this, time);
             CloseParent();
         }
diff --git a/SunnyUI/Controls/UIDatePicker.cs b/SunnyUI/Controls/UIDatePicker.cs
index 981b0c8a..9bee9d04 100644
--- a/SunnyUI/Controls/UIDatePicker.cs
+++ b/SunnyUI/Controls/UIDatePicker.cs
@@ -25,6 +25,8 @@ using System.ComponentModel;
 namespace Sunny.UI
 {
     [ToolboxItem(true)]
+    [DefaultProperty("Value")]
+    [DefaultEvent("ValueChanged")]
     public sealed partial class UIDatePicker : UIDropControl
     {
         public delegate void OnDateTimeChanged(object sender, DateTime value);
diff --git a/SunnyUI/Controls/UIDateTimePicker.cs b/SunnyUI/Controls/UIDateTimePicker.cs
index 2587ffad..34f37eac 100644
--- a/SunnyUI/Controls/UIDateTimePicker.cs
+++ b/SunnyUI/Controls/UIDateTimePicker.cs
@@ -5,6 +5,8 @@ using System.Windows.Forms;
 namespace Sunny.UI
 {
     [ToolboxItem(true)]
+    [DefaultProperty("Value")]
+    [DefaultEvent("ValueChanged")]
     public sealed partial class UIDatetimePicker : UIDropControl
     {
         private void InitializeComponent()
diff --git a/SunnyUI/Controls/UITimePicker.cs b/SunnyUI/Controls/UITimePicker.cs
index 62ede806..c275f4b6 100644
--- a/SunnyUI/Controls/UITimePicker.cs
+++ b/SunnyUI/Controls/UITimePicker.cs
@@ -26,6 +26,8 @@ using System.Windows.Forms;
 namespace Sunny.UI
 {
     [ToolboxItem(true)]
+    [DefaultProperty("Value")]
+    [DefaultEvent("ValueChanged")]
     public sealed partial class UITimePicker : UIDropControl
     {
         private void InitializeComponent()