diff --git a/src/main/java/cokr/xit/foundation/data/DataFormat.java b/src/main/java/cokr/xit/foundation/data/DataFormat.java
index 738c8b2..722f08c 100644
--- a/src/main/java/cokr/xit/foundation/data/DataFormat.java
+++ b/src/main/java/cokr/xit/foundation/data/DataFormat.java
@@ -1,6 +1,8 @@
 package cokr.xit.foundation.data;
 
 import java.text.DecimalFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
 
 import cokr.xit.foundation.AbstractComponent;
 
@@ -28,15 +30,19 @@ public class DataFormat extends AbstractComponent {
 	public static final String yyyy_mm_dd(Object obj) {
 		if (isEmpty(obj)) return "";
 
-		String str = obj.toString();
-		int length = str.length(),
-			pos = length - 2;
+		if (obj instanceof String) {
+			String str = obj.toString();
+			int length = str.length(),
+				pos = length - 2;
 
-		String
-			day = str.substring(pos),
-			month = str.substring(pos = pos - 2, pos + 2),
-			year = str.substring(0, pos);
-		return String.format("%s-%s-%s", year, month, day);
+			String
+				day = str.substring(pos),
+				month = str.substring(pos = pos - 2, pos + 2),
+				year = str.substring(0, pos);
+			return String.format("%s-%s-%s", year, month, day);
+		} else {
+			return yyyy_mm_dd_hh_mm_ss(obj).substring(0, 10);
+		}
 	}
 
 	/**HHmmss 포맷의 문자열을 HH:mm:ss 포맷으로 변환하여 반환한다.
@@ -46,37 +52,48 @@ public class DataFormat extends AbstractComponent {
 	public static final String hh_mm_ss(Object obj) {
 		if (isEmpty(obj)) return "";
 
-		String str = obj.toString();
-		int length = str.length(),
-			pos = length - 2;
+		if (obj instanceof String) {
+			String str = obj.toString();
+			int length = str.length(),
+				pos = length - 2;
 
-		String
-			ss = str.substring(pos),
-			mm = str.substring(pos = pos - 2, pos + 2),
-			hh = str.substring(0, pos);
-		return String.format("%s:%s:%s", hh, mm, ss);
+			String
+				ss = str.substring(pos),
+				mm = str.substring(pos = pos - 2, pos + 2),
+				hh = str.substring(0, pos);
+			return String.format("%s:%s:%s", hh, mm, ss);
+		} else {
+			return yyyy_mm_dd_hh_mm_ss(obj).substring(11);
+		}
 	}
 
+	private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
+
 	/**yyyyMMddHHmmss, 또는 yyMMddHHmmss 포맷의 문자열을 yyyy-MM-dd HH:mm:ss 포맷으로 변환하여 반환한다.
 	 * @param obj yyyyMMddHHmmss, 또는 yyMMddHHmmss 포맷의 문자열
 	 * @return yyyy-MM-dd HH:mm:ss 포맷 문자열
 	 */
-	public static final String yyyy_MM_dd_HH_mm_ss(Object obj) {
+	public static final String yyyy_mm_dd_hh_mm_ss(Object obj) {
 		if (isEmpty(obj)) return "";
 
-		String str = obj.toString();
-		int length = str.length(),
-			pos = length - 6;
-
-		try {
-			String
-				date = str.substring(0, pos),
-				time = str.substring(pos);
-
-			return yyyy_mm_dd(date) + " " + hh_mm_ss(time);
-		} catch (Exception e) {
-			return str;
-		}
+		if (obj instanceof String) {
+			String str = obj.toString();
+			int length = str.length(),
+				pos = length - 6;
+
+			try {
+				String
+					date = str.substring(0, pos),
+					time = str.substring(pos);
+
+				return yyyy_mm_dd(date) + " " + hh_mm_ss(time);
+			} catch (Exception e) {
+				return str;
+			}
+		} else if (obj instanceof Date)
+			return dateFormat.format((Date)obj);
+		else
+			throw new IllegalArgumentException(obj + " is not a Date");
 	}
 
 	private static final DecimalFormat numberFormat = new DecimalFormat("#,##0.00");