Fix: get ranking with date, time

src/game/lib/string_util.js

@@ -20,4 +20,9 @@ class StringUtil {
 			return numberWithCommas + " 점";
 	}
 
+	static getNumberStartWithZero(number, digitCount) {
+		let n = number + '';
+		return n.length >= digitCount ? n : new Array(digitCount - n.length + 1).join('0') + n;
+	}
+
 }