Bug: ZonedDateTimeConverter 파일 추가

src/main/java/com/senity/waved/common/ZonedDateTimeConverter.java

@@ -0,0 +1,23 @@
+package com.senity.waved.common;
+
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+
+@Converter(autoApply = true)
+public class ZonedDateTimeConverter implements AttributeConverter<ZonedDateTime, Timestamp> {
+
+    @Override
+    public Timestamp convertToDatabaseColumn(ZonedDateTime zonedDateTime) {
+        return (zonedDateTime == null ? null : Timestamp.from(zonedDateTime.toInstant()));
+    }
+
+    @Override
+    public ZonedDateTime convertToEntityAttribute(Timestamp sqlTimestamp) {
+        return (sqlTimestamp == null ? null : ZonedDateTime.ofInstant(sqlTimestamp.toInstant(), ZoneId.systemDefault()));
+    }
+}