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How to change the width of the WinForms DateTimePicker (DateTimePickerAdv) when it is set to custom format?

Platform: WinForms |
Control: DateTimePickerAdv

Date time format

It is possible to adjust the width of the DateTimePickerAdv according to the custom format given. The width of the DateTimePickerAdv is calculated by adding the following constraints.

  • Width of the DateTimePickerUpDownButton
  • Width of the DateTimePickerDropButton
  • Font size of the DateTimePickerAdv
  • The length of the DataTimePickerAdv's Value in custom format


this.dateTimePickerAdv3.ShowCheckBox = false;
this.dateTimePickerAdv3.ShowUpDown = true;
this.dateTimePickerAdv3.AutoSize = false;
this.dateTimePickerAdv3.AutoSizeMode = AutoSizeMode.GrowOnly;
this.dateTimePickerAdv3.Format = DateTimePickerFormat.Custom;
this.dateTimePickerAdv3.CustomFormat = "dd/MMM";
int updownWidth = 0, dropWidth = 0;
foreach (Control ctrl in this.dateTimePickerAdv3.Controls)
   if (ctrl.GetType().ToString() == "Syncfusion.Windows.Forms.Tools.DateTimePickerUpDownButton")
     updownWidth = ctrl.Size.Width;
   else if (ctrl.GetType().ToString() == "Syncfusion.Windows.Forms.Tools.DateTimePickerDropButton")
     dropWidth = ctrl.Size.Width;
//Sum up the width of drop down button, updown button and font.
int nWidth = dropWidth + updownWidth + Convert.ToInt32(this.dateTimePickerAdv3.Font.Size *
this.dateTimePickerAdv3.Width = nWidth;



Me.dateTimePickerAdv3.ShowCheckBox = False
Me.dateTimePickerAdv3.ShowUpDown = True
Me.dateTimePickerAdv3.AutoSize = False
Me.dateTimePickerAdv3.AutoSizeMode = AutoSizeMode.GrowOnly
Me.dateTimePickerAdv3.Format = DateTimePickerFormat.Custom
Me.dateTimePickerAdv3.CustomFormat = "dd/MMM"
Dim updownWidth As Integer = 0, dropWidth As Integer = 0
For Each ctrl As Control In Me.dateTimePickerAdv3.Controls
   If ctrl.GetType().ToString() = "Syncfusion.Windows.Forms.Tools.DateTimePickerUpDownButton" Then
     updownWidth = ctrl.Size.Width
   Else If ctrl.GetType().ToString() = "Syncfusion.Windows.Forms.Tools.DateTimePickerDropButton" Then
     dropWidth = ctrl.Size.Width
   End If
Next ctrl
''Sum up the width of drop down button, updown button and font.
Dim nWidth As Integer = dropWidth + updownWidth + Convert.ToInt32(Me.dateTimePickerAdv3.Font.Size * Me.dateTimePickerAdv3.Value.ToString(Me.dateTimePickerAdv3.CustomFormat).Length)
Me.dateTimePickerAdv3.Width = nWidth


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