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SELECT DateText, isnull(convert(char(10), cast(DateText as datetime), 101), '') as Original, isnull(convert(char(10), cast(nullif(DateText, '') as datetime), 101), '') as Fixed FROM ( VALUES ('20240111'), (''), (NULL) ) V(DateText)
DateText
Original
Fixed
20240111
01/11/2024
01/11/2024
01/01/1900
null