Encountering the following error when updating product options..

Page URL:/admin2013/entityEditProducts.aspx
Source:.Net SqlClient Data Provider
Message:The conversion of a nvarchar data type to a datetime data type resulted in an out-of-range value.
The statement has been terminated.
Stack Trace:
at AspDotNetStorefrontCore.DB.ExecuteSQL(String Sql)
at AspDotNetStorefrontAdmin.entityEditProducts.Update Product() in c:\inetpub\wwwroot\Web\Admin2013\entityEditProduct s.aspx.cs:line 1548
at AspDotNetStorefrontAdmin.entityEditProducts.btnSub mit_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\Web\Admin2013\entityEditProduct s.aspx.cs:line 1085
at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
at System.Web.UI.WebControls.Button.RaisePostBackEven t(String eventArgument)
at System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Any solution for this? Thanks!