Embedded SQL Help with CURRENT_DATE

I am trying to create a task that has a variable property that a user can specify DaysBack but it keeps coming up blank when I ask the system to get the date as of DaysBack from the CURRENT_DATE. Can someone tell me why I am not getting a value back in my tDate variable?

Class OSU.Workday.TerminationsTask Extends %SYS.Task.Definition
{

Parameter TaskName As STRING = "OSU - Workday Termination Update";

Property DaysBack As %Integer [ InitialExpression = 1 ];

Method OnTask() As %Status
{
	Set tSC=$$$OK
	#Dim tException as %Exception.SystemException
    try{
        set tDate = ""
        &sql(SELECT DATEADD('day', -:daysBack, CURRENT_DATE) INTO :tDate)
        ZWRITE tDate
        set tSC = ..SelectTerminations(tDate)
        $$$ThrowOnError(tSC)
    }Catch (tException) {
		Set tSC = tException.AsStatus()
	}
	Return tSC
}

Method SelectTerminations(pDate As %DateTime) As %Status
{
    Set tSC=$$$OK
    #Dim ex as %Exception.SystemException
    try
    {
        set sqlQuery = "SELECT EMPLID, MedCtrID, LastName, FirstName, EFFDT FROM OSU_Workday_SQL.PDMTerminations WHERE EFFDT > ?)"
        set tStatment = ##class(%SQL.Statement).%New()
        Set qStatus = tStatment.%Prepare(sqlQuery)
        $$$ThrowOnError(qStatus)
        set rset = tStatment.%Execute(pDate)
        $$$ThrowOnError(rset)
        #Dim tTermService As OSU.DataSource.Workday.TermService
        set tTermConfigName="OSU.DataSource.Workday.TermService"
        $$$ThrowOnError(##class(Ens.Director).CreateBusinessService(tEIDEMPIDConfigName,.tEIDEMPIDService))
        if rset.%ROWCOUNT > 0       
        {
            set tTerm = ##class(OSU.Workday.Messages.WorkdayTerminations).%New()
            while rset.%Next()
            {
                set tTerm.EMPLID = rset.%Get("EMPLID")
                set tTerm.MedCtrID = rset.%Get("MedCtrID")
                set tTerm.Lastname = rset.%Get("LastName")
                set tTerm.Firstname = rset.%Get("FirstName")
                set tTerm.EFFDT = rset.%Get("EFFDT")
                set tSC = tTerm.%Save()
                $$$ThrowOnError(tSC)
                set (tTermOutput,tHint) = ""
                $$$ThrowOnError(tTermService.OnProcessInput(tTerm,.tTermOutput,.tHint))
            }
        }
    }
    Catch ex
    {
        Set tSC = ex.AsStatus()
    }
    Return tSC
}

ClassMethod TestTask() As %Status
{
   
    Set tSC=$$$OK
	set tTask = ##class(OSU.Workday.TerminationsTask).%New()
	$$$ThrowOnError(tTask.OnTask())
    Return tSC
}

/// Location and Revision of this file in Perforce (Auto-updating)
Parameter SrcVer = "$Id: //custom_ccrs/us/OSUM/OSUMHSCUSTOM/UAT/cls/OSU/Workday/TerminationsTask.xml#3 $";

}