Try this:
DECLARE @FromDate datetime
DECLARE @ToDate datetime
SELECT @FromDate=FromDateCol FROM TableName
SELECT @ToDate=ToDateCol FROM TableName
WITH cte AS
(
SELECT CAST(@FromDate AS DATETIME) DateValue
UNION ALL
SELECT DateValue + 1
FROM cte
WHERE DateValue + 1 < @ToDate
)
SELECT DateValue
FROM cte
OPTION (MAXRECURSION 0)