Either one of these could be the problem/solution:
The #Num! in Access is telling you the cell contains a mix of data; some digitit, some text, for example: 34G (or your '-') would throw a #Num!
You need to go back to the Excel and change the format of any cell containing both numbers and text to "mixed data" then save that sheet before importing to Access.
You can do this with a Macro:
Sub Addspace()
Dim cell As Object
For Each cell In Selection
cell.Value = " " & cell.Value
cell.Value = Right(cell.Value, Len(cell.Value) - 1)
Next
End Sub
Simply highlight cells needing the formatting, run the above macro, then re-save spreadsheet.
Or:
The #Num! error value means that the value in the field is too large (either positively or negatively) to be stored in the field, based on the field's DataType or FieldSize property setting. (https://support.microsoft.com/en-us/kb/209132)
Based on your format of the dates, I would try the first fix before anything else. Date =/= Number
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