Private Sub cmdSearch_Click()
    On Error GoTo ErrHandler
    'Dim i As Integer, rowIdx As Integer ' 循环变量
    Dim startDate As String, endDate As String
    Dim sql As String
    ' ========== 新增：根据勾选状态选择查询模式 ==========
    If chkUseTime.Value = vbChecked Then
        ' 模式1：按精准时间查询（CreateTime字段）
        startDate = Format(dtpStart.Value, "yyyy-mm-dd")
        endDate = Format(dtpEnd.Value, "yyyy-mm-dd")
        
               sql = "SELECT " & _
              "RecordDate AS 日期, " & _
              "UploadCount AS 实际上传次数, " & _
              "ShouldUpload AS 应上传次数, " & _
              "Recorder AS 记录人, " & _
              "UploadDate AS 上传时间, " & _
              "Format(CreateTime, 'yyyy-mm-dd HH:MM:ss') AS 记录创建时间 " & _
              "FROM " & currentDeviceTable & _
              " WHERE UploadDate BETWEEN #" & startDate & "# AND #" & endDate & "# " & _
              "ORDER BY UploadDate DESC"
    End If
 
    ' 执行查询
    rs.Open sql, conn, adOpenKeyset, adLockOptimistic
   
   
   
    ' 绑定到DataGrid
    Set dgRecord.DataSource = rs
   
  
    'Debug.Print "DataGrid可见性：" & dgRecord.Visible ' 应显示True
    'Debug.Print "DataGrid启用状态：" & dgRecord.Enabled ' 应显示True
    'Debug.Print "DataGrid列数：" & dgRecord.Columns.Count ' 有数据时应显示6（与查询字段数一致）
    With dgRecord
        If Not (rs.EOF And rs.BOF) Then
            .Columns(0).Caption = "日期"
            .Columns(1).Caption = "实际上传次数"
            .Columns(2).Caption = "应上传次数"
            .Columns(3).Caption = "记录人"
            .Columns(4).Caption = "上传时间"
            .Columns(5).Caption = "记录创建时间"
            ' 调整列宽
            .Columns(0).Width = 1800
            .Columns(1).Width = 1200
            .Columns(2).Width = 1200
            .Columns(3).Width = 1200
            .Columns(4).Width = 1800
            .Columns(5).Width = 2800
        End If
    End With
   
    dgRecord.Refresh

这里是板块，你说的是vb6，应该去vb6板块。
现在来vb板块的人很少了，是不是业余的人很少了呢

你的这个问题，要先去掉 On Error GoTo ErrHandler 这个 语句再调试运行，看看有没有什么错误提示。