See if this does what you want. This is sheet code for the worksheet that holds the table. It assumes the layout shown in your image. At the start of each day, double-click cell A1 on that sheet to clear the color fill from the previous day's use.
To install the code:
1. Right-click the worksheet tab you want to apply it to and choose 'View Code'. This will open the VBE window.
2. Copy the code below from your browser window and paste it into the white space in the VBE window.
3. Close the VBE window and Save the workbook. If you are using Excel 2007 or a later version do a SaveAs and save it as a macro-enabled workbook (.xlsm file extension).
4. Make sure you have enabled macros whenever you open the file or the code will not run.
Code:
Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
If Target.Address = "$A$1" Then Range("B3:K9").Interior.Color = xlNone
End Sub
Private Sub Worksheet_Change(ByVal Target As Range)
Dim c As Range
If Not Intersect(Target, Range("B3:K9")) Is Nothing Then
For Each c In Intersect(Target, Range("B3:K9"))
Target.Interior.ColorIndex = vbYellow
Next c
End If
End Sub