Update Data By Ado - Change/delete Data And Then Run Macro For Update Data In Source Spreadsheet

I have one source spreadsheet, where are columns NAME, DATE. I read these data by ADO to other spreadsheet, where I can change/delete data and then run macro for update data in source spreadsheet. The problem: In source spreadsheet is column "NAME" and column "DATE", with values e.g. "Joseph"; 1.1.1980. I read this data to other spreadsheet, then I delete in it value 1.1.1980. When I run macro Update, it messages error.

Sub UpdateItem
...
.Fields.Item(1).value = activecell 'activecell value = "Joseph"
If Not isempty(activecell.offset(0,1)) Then
.Fields.Item(2).value = activecell.offset(0,1).value
Else
.Fields.Item(2).value = "" 'I tried Empty and 0 too but when I read data again then, it displays 0.1.1900, nothing works
End If
...
End Sub

It seems that in source spreadsheet has data in column "Date" format Date and when I try to update data in format String ("") in source spreadsheet by Update macro, it messages error. When I used

.Fields.Item(2).Value = Empty
' or
.Fields.Item(2).Value = 0

after rereading data it displays 0.1.1900 What I want to get is that if the cell with date (in other spreadsheet) is empty, the cell in column Date in source spreadsheet after updating will be blank (contains no values).