diff --git a/kfet/static/kfet/js/kfet.api.js b/kfet/static/kfet/js/kfet.api.js
index 20f1203f..d94a8b5b 100644
--- a/kfet/static/kfet/js/kfet.api.js
+++ b/kfet/static/kfet/js/kfet.api.js
@@ -620,7 +620,7 @@ class Day extends ModelObject {
 
     //Parse date and round it
     get date()  { return this._date; }
-    set date(v) { this._date = dateUTCToParis(v).startof('date'); }
+    set date(v) { this._date = dateUTCToParis(v).startOf('date'); }
 }
 
 
@@ -722,7 +722,10 @@ class Operation extends ModelObject {
     static get verbose_name() { return 'operation'; }
 
     formatter() {
-        return OperationFormatter;
+        if (this.type === 'purchase')
+            return PurchaseFormatter;
+        else
+            return SpecialOpeFormatter;
     }
 
     get amount()  { return this._amount; }
@@ -961,16 +964,15 @@ class ArticleList extends APIModelList {
 
     /**
      * Default structure for ArticleList instances
-     * @abstract
      * @default <tt>[Article, ArticleCategory]</tt>
+     * @see {@link Models.ModelList.models|ModelList.models}
      */
     static get models() { 
         return [Article, ArticleCategory]; 
     }
 
     /**
-     * Default url to get ArticlList data
-     * @abstract
+     * Default url to get ArticleList data
      * @default <tt>django-js-reverse('kfet.kpsul.articles_data')</tt>
      * @see {@link Models.APIModelList.url_model|APIModelList.url_model}
      */
@@ -979,6 +981,30 @@ class ArticleList extends APIModelList {
     }
 }
 
+/**
+ * OperationList model. Can be accessed through API.
+ * @extends Models.APIModelList
+ * @memberof Models
+ */
+class OperationList extends APIModelList {
+    /**
+     * Default structure for OperationList instances.
+     * @default <tt>[Operation, OperationGroup, Day]</tt>
+     * @see {@link Models.ModelList.models|ModelList.models}
+     */
+    static get models() {
+        return [Operation, OperationGroup, Day];
+    }
+
+    /**
+     * Default url to get OperationList data.
+     * @default <tt>django-js-reverse('kfet.history.json')</tt>
+     * @see {@link Models.APIModelList.url_model|APIModelList.url_model}
+     */
+    static get url_model() {
+        return Urls['kfet.history.json']();
+    }
+}
 
 
 /* ---------- ---------- */
@@ -1293,7 +1319,10 @@ class OpegroupFormatter extends Formatter {
     }
 
     static prop_valid_by(a) {
-        return 'Par '+a.valid_by;
+        if (a.valid_by)
+            return 'Par '+a.valid_by;
+        else
+            return '';
     }
 }