diff --git a/src/utils/common.js b/src/utils/common.js
index 2ee3ff5..9c8c157 100644
--- a/src/utils/common.js
+++ b/src/utils/common.js
@@ -13,7 +13,7 @@ export const convertKTC = (dt, nation = true) => {
 		timeZone: 'Asia/Seoul',
 	};
 
-	return nation ? date.toLocaleString('ko-KR', options) + " KTC" : date.toLocaleString('ko-KR', options);
+	return nation ? date.toLocaleString('ko-KR', options) + " KST" : date.toLocaleString('ko-KR', options);
 }
 
 export const convertKTCDate = (dt) => {
diff --git a/src/utils/date.js b/src/utils/date.js
index 2fa5926..d751017 100644
--- a/src/utils/date.js
+++ b/src/utils/date.js
@@ -1,4 +1,4 @@
-import { ONE_MINUTE_MS } from '../assets/data/adminConstants';
+import { ONE_MINUTE_MS, ONE_MINUTE_SECOND } from '../assets/data/adminConstants';
 
 export const convertStartDateToISO = (date) => {
 	if (!date) return null;
@@ -31,6 +31,30 @@ export const getTimeOnly = (dateString) => {
 	});
 };
 
+export const getDateOnly = (dateString) => {
+	const date = new Date(dateString);
+	return date.toISOString().slice(0, 10);
+}
+
 export const msToMinutes = (ms) => {
 	return ms / ONE_MINUTE_MS;
+}
+
+export const secondToMinutes = (second) => {
+	return second / ONE_MINUTE_SECOND;
+}
+
+export const isValidDayRange = (start_dt, end_dt) => {
+	const startDate = new Date(start_dt);
+	const endDate = new Date(end_dt);
+
+	// 시간을 00:00:00으로 설정하여 날짜만 비교
+	const startDateOnly = new Date(startDate.getFullYear(), startDate.getMonth(), startDate.getDate());
+	const endDateOnly = new Date(endDate.getFullYear(), endDate.getMonth(), endDate.getDate());
+
+	const diffTime = endDateOnly.getTime() - startDateOnly.getTime();
+
+	const oneDay = 24 * 60 * 60 * 1000;
+
+	return diffTime >= oneDay;
 }
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