fix day

@@ -60,7 +60,7 @@ class Day {
     const days = Math.floor((today - date) / (24 * 60 * 60 * 1000)) + 1;
 
     if (days > 5) {
-      return `${this.year()}-${this._fix(this.month(), 2)}-${this._fix(this.day(), 2)}`;
+      return `${this.year()}-${this._fix(this.month(), 2)}-${this._fix(this.date(), 2)}`;
     } else if (days > 2) {
       return '2天前';
     } else if (days > 1) {