diff --git a/internal/value.go b/internal/value.go
index 69fb72f..457362c 100644
--- a/internal/value.go
+++ b/internal/value.go
@@ -304,15 +304,6 @@ func (sv StringValue) ToTime() (time.Time, error) {
 	case isTimestamp(raw):
 		return parseTimestamp(raw, time.UTC)
 	}
-	if f, err := strconv.ParseFloat(raw, 64); err == nil {
-		return TimestampFromFloatValue(f)
-	}
-	if i64, err := strconv.ParseInt(raw, 10, 64); err == nil {
-		if i64 > time.Unix(0, 0).Unix()*int64(time.Millisecond) {
-			return TimestampFromInt64Value(i64)
-		}
-		return DateFromInt64Value(i64)
-	}
 	return time.Time{}, fmt.Errorf("failed to convert %s to time.Time type", sv)
 }
 
diff --git a/query_test.go b/query_test.go
index e0de653..0d9102b 100644
--- a/query_test.go
+++ b/query_test.go
@@ -2951,6 +2951,12 @@ SELECT item FROM Produce WHERE Produce.category = 'vegetable' QUALIFY RANK() OVE
 			query:       `SELECT CAST("apple" AS INT64) AS not_a_number`,
 			expectedErr: `failed to analyze: INVALID_ARGUMENT: Could not cast literal "apple" to type INT64 [at 1:13]`,
 		},
+		// Regression test for goccy/go-zetasqlite#175
+		{
+			name:        "cast integer to datetime",
+			query:       `WITH toks AS (SELECT "20100317" AS dt) SELECT CAST(dt AS DATETIME) FROM toks;`,
+			expectedErr: "failed to convert 20100317 to time.Time type",
+		},
 		{
 			name:         "safe cast",
 			query:        `SELECT SAFE_CAST(x AS STRING) FROM UNNEST([1, 2, 3]) AS x`,