Fix date timezones to avoid operation saved on the day before the one entered.

src/operations/operation.form.tmpl.html

@@ -27,7 +27,7 @@
       <div class="col-sm-8">
         <input class="form-control" id="operation-date" name="operation_date"
           type="text" ng-model="$ctrl.operation.operation_date"
-          bs-datepicker data-date-format="yyyy-MM-dd"
+          bs-datepicker data-date-format="yyyy-MM-dd" data-timezone="UTC"
           placeholder="Operation date">
       </div>
     </div>