Want to add date to SQL results as static column, in Powershell

so I have the following powershell script, the script works however i would like to add a column to the front of the table that is simply 'date' and every line would have '$dMonth' in the beginning of the csv.

$dMonth= (Get-Date).AddMonths(-0).ToString("dd-MM-yyyy")
$DBServer = "cdiserv1"
$databasename = "SUBSCRIBER"
$Connection = new-object system.data.sqlclient.sqlconnection
$Connection.ConnectionString ="server=$DBServer;database=$databasename;trusted_connection=True"

$SqlCmd = New-Object System.Data.SqlClient.SqlCommand

$SqlQuery = @"
SELECT  isnull(B.AcctLineCode, '') AS OLC,
        isnull(B.AcctNum, '') AS OAN,
        isnull(A.AcctLineCode, '') as NLC,
        isnull(A.AcctNum, '') AS NAN,
        isnull(B.Name, '') AS ONA,
        isnull(A.Name, '') as NNA,
        isnull(B.UserField1, '') AS O1,
        isnull(B.UserField2, '') AS O2,
        isnull(B.UserField3, '') AS O3,
        isnull(A.UserField1, '') AS N1,
        isnull(A.UserField2, '') AS N2,
        isnull(A.UserField3, '') AS N3,
        case when A.AcctNum != B.AcctNum or A.AcctLineCode != B.AcctLineCode then 'ACCOUNT MOVED'
        when A.Name != B.Name then 'NAME CHANGE'
        when A.UserField1 != B.UserField1 OR A.UserField2 != B.UserField2 OR A.UserField3 != B.UserField3 then 'FEATURE CHANGE'
        when A.AccountID is not null and B.AccountID is null then 'ADDED ACCOUNT' 
        when A.AccountID is null and B.AccountID is not null then 'DEELETED ACCOUNT' end [Result]
FROM    [CDISERV1].[SUBSCRIBER].[dbo].[Subscriber Data] A
        FULL OUTER JOIN [CDISERV2].[SUBSCRIBER].[dbo].[Subscriber Data] B ON A.AccountID = B.AccountID
WHERE (A.AccountID is not null and B.AccountID is null)
OR (A.AccountID is null and B.AccountID is not null)
OR A.AcctLineCode != B.AcctLineCode
OR A.AcctNum != B.AcctNum
OR A.Name != B.Name
OR A.UserField1 != B.UserField1
OR A.UserField2 != B.UserField2
OR A.UserField3 != B.UserField3
"@
    
$Connection.open()
$SqlCmd.CommandText = $SqlQuery
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$SqlCmd.Connection = $Connection
$dt = New-Object System.Data.DataTable
$SqlAdapter.Fill($dt) | Out-Null
$Connection.Close()
$dt | Export-Csv -Path Z:\OP\CSV\AIS$dMonth.CSV -force -NoTypeInformation

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i really wanted to have the script merge into a single file, as i run this script every evening just before midnight, if it would append the date would show when the data was extrapolated essentially as a log, i have discovered sadly this is not possible for Export-Csv with the version of powershell i am using so i merge the files after exporting.

my desired results would look like the following...
"date","OLC","OAN","NLC","NAN","ONA","NNA","O1","O2","O3","N1","N2","N3","Result"
"15-05-2018","xxx","1234","xxx","1233","na","na","c7","n3","b5"," "," "," ","ACCOUNT MOVED"
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csePixelatedAsked:
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oBdACommented:
Export-Csv may not support it, but Select-Object and its "calculated properties" does.
Just replace the last line in your script with these two:
$date = Get-Date -Format 'dd-MM-yyyy'
$dt | Select-Object -Property @{n='Date'; e={$date}}, * | Export-Csv -Path Z:\OP\CSV\AIS$dMonth.CSV -force -NoTypeInformation

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csePixelatedAuthor Commented:
Wonderful, thank you oBdA
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csePixelatedAuthor Commented:
I know i have closed this, but i now have 3 aditional colums other than the date, at the end of the table i have, Table, ItemAray, & HasErrors

how do i exclude these columns?
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csePixelatedAuthor Commented:
actually its 5 additional columns, i forgot RowErrror & RowState...
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oBdACommented:
I'm really tempted to just loudly ignore this, since you already gave the answer yourself ;)
Select-Object has an -ExcludeProperty argument (and exclude would work just as well)
Anyway, the last line(s) would need to be
$dt | Select-Object -Property @{n='Date'; e={$date}}, * -ExcludeProperty  Table, ItemAray, HasErrors, RowErrror, RowState |
	Export-Csv -Path Z:\OP\CSV\AIS$dMonth.CSV -force -NoTypeInformation

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csePixelatedAuthor Commented:
Once again, thank you oBdA
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