diff --git a/src/main/java/com/moabam/api/application/room/CertificationService.java b/src/main/java/com/moabam/api/application/room/CertificationService.java
index e6a56ab3..94f49a73 100644
--- a/src/main/java/com/moabam/api/application/room/CertificationService.java
+++ b/src/main/java/com/moabam/api/application/room/CertificationService.java
@@ -111,7 +111,8 @@ public Certification findCertification(Long certificationId) {
 	private void validateCertifyTime(LocalDateTime now, int certifyTime) {
 		LocalTime targetTime = LocalTime.of(certifyTime, 0);
 		LocalDateTime targetDateTime = LocalDateTime.of(now.toLocalDate(), targetTime);
-		if (certifyTime == MIDNIGHT_HOUR) {
+
+		if (certifyTime == MIDNIGHT_HOUR && now.getHour() == ONE_HOUR_BEFORE_MIDNIGHT_HOUR) {
 			targetDateTime = targetDateTime.plusDays(1);
 		}
 
diff --git a/src/main/java/com/moabam/global/common/util/GlobalConstant.java b/src/main/java/com/moabam/global/common/util/GlobalConstant.java
index 7b62d447..c4d6ce53 100644
--- a/src/main/java/com/moabam/global/common/util/GlobalConstant.java
+++ b/src/main/java/com/moabam/global/common/util/GlobalConstant.java
@@ -11,6 +11,7 @@ public class GlobalConstant {
 	public static final String CHARSET_UTF_8 = ";charset=UTF-8";
 	public static final String SPACE = " ";
 	public static final int MIDNIGHT_HOUR = 0;
+	public static final int ONE_HOUR_BEFORE_MIDNIGHT_HOUR = 23;
 	public static final int ONE_HOUR = 1;
 	public static final int HOURS_IN_A_DAY = 24;
 	public static final int NOT_COMPLETED_RANK = 500;