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["생년월일","날짜 변환","나이"]
["2000-01-01",{"$f":"DATEVALUE(A3)","v":"2000-01-01"},{"$f":"DATEDIF(A3,TODAY(),\"y\")","v":23}]
["2000-01-02",{"$f":"DATE(LEFT(A4,4), MID(A4,6,2), RIGHT(A4,2))","v":"2000-01-02"},{"$f":"DATEDIF(A4,TODAY(),\"y\")","v":23}]
["2000-01-03",null,23]
["2000-01-04",null,{"$f":"DATEDIF(A6,TODAY(),\"y\")","v":23}]
["2000-01-05",null,23]
["2000-01-06",null,23]
["2000-01-07",null,23]
["2000-01-08",null,23]
["2000-01-09",null,23]
["2000-01-10",null,23]