diff --git a/Clody_iOS/Clody_iOS/Global/Extensions/Date+.swift b/Clody_iOS/Clody_iOS/Global/Extensions/Date+.swift
index 1a73027..b668cef 100644
--- a/Clody_iOS/Clody_iOS/Global/Extensions/Date+.swift
+++ b/Clody_iOS/Clody_iOS/Global/Extensions/Date+.swift
@@ -46,20 +46,9 @@ extension Date {
     }
     
     func toKSTDiaryString() -> String {
-        let now = Date()
-        let calendar = Calendar.current
-        var targetDate = now
-        
-        if calendar.isDateInYesterday(self) {
-            if let adjustedDate = calendar.date(byAdding: .day, value: -1, to: now) {
-                targetDate = adjustedDate
-            }
-        }
-        
         let formatter = DateFormatter()
-        formatter.locale = Locale(identifier: "en_US_POSIX")
         formatter.timeZone = TimeZone(identifier: "Asia/Seoul")
         formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
-        return formatter.string(from: targetDate)
+        return formatter.string(from: self)
     }
 }