diff --git a/hwe/sammo/API/Auction/OpenBuyRiceAuction.php b/hwe/sammo/API/Auction/OpenBuyRiceAuction.php
index ae2b74c8..b7825f23 100644
--- a/hwe/sammo/API/Auction/OpenBuyRiceAuction.php
+++ b/hwe/sammo/API/Auction/OpenBuyRiceAuction.php
@@ -73,7 +73,7 @@ class OpenBuyRiceAuction extends \sammo\BaseAPI
     $initYearMonth = Util::joinYearMonth($initYear, $initMonth);
     $yearMonth = Util::joinYearMonth($year, $month);
 
-    if($yearMonth <= $initYearMonth + 3){
+    if($yearMonth < $initYearMonth + 3){
       return '시작 후 3개월이 지나야 경매를 열 수 있습니다.';
     }
 
diff --git a/hwe/sammo/API/Auction/OpenSellRiceAuction.php b/hwe/sammo/API/Auction/OpenSellRiceAuction.php
index efb38972..faddaf24 100644
--- a/hwe/sammo/API/Auction/OpenSellRiceAuction.php
+++ b/hwe/sammo/API/Auction/OpenSellRiceAuction.php
@@ -73,7 +73,7 @@ class OpenSellRiceAuction extends \sammo\BaseAPI
     $initYearMonth = Util::joinYearMonth($initYear, $initMonth);
     $yearMonth = Util::joinYearMonth($year, $month);
 
-    if($yearMonth <= $initYearMonth + 3){
+    if($yearMonth < $initYearMonth + 3){
       return '시작 후 3개월이 지나야 경매를 열 수 있습니다.';
     }
 
diff --git a/hwe/sammo/API/Auction/OpenUniqueAuction.php b/hwe/sammo/API/Auction/OpenUniqueAuction.php
index 40def74d..0071d763 100644
--- a/hwe/sammo/API/Auction/OpenUniqueAuction.php
+++ b/hwe/sammo/API/Auction/OpenUniqueAuction.php
@@ -64,7 +64,7 @@ class OpenUniqueAuction extends \sammo\BaseAPI
     $initYearMonth = Util::joinYearMonth($initYear, $initMonth);
     $yearMonth = Util::joinYearMonth($year, $month);
 
-    if($yearMonth <= $initYearMonth + 3){
+    if($yearMonth < $initYearMonth + 3){
       return '시작 후 3개월이 지나야 경매를 열 수 있습니다.';
     }