@@ -4,6 +4,7 @@
 
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Validation\Rule;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Represents a group definition.
@@ -30,6 +31,7 @@
  */
 class Group extends Model
 {
+    use SerializeToIso8601;
 
     protected $fillable = [
         'name',
 
@@ -9,6 +9,7 @@
 use ProcessMaker\Nayra\Contracts\Bpmn\ScriptTaskInterface;
 use ProcessMaker\Nayra\Contracts\Storage\BpmnDocumentInterface;
 use ProcessMaker\Nayra\Storage\BpmnDocument;
+use ProcessMaker\Traits\SerializeToIso8601;
 use Spatie\MediaLibrary\HasMedia\HasMedia;
 use Spatie\MediaLibrary\HasMedia\HasMediaTrait;
 
@@ -47,6 +48,7 @@
 class Process extends Model implements HasMedia
 {
     use HasMediaTrait;
+    use SerializeToIso8601;
 
     /**
      * The attributes that aren't mass assignable.
 
@@ -5,6 +5,7 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Validation\Rule;
 use ProcessMaker\Models\Process;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Represents a business process category definition.
@@ -30,6 +31,7 @@
  */
 class ProcessCategory extends Model
 {
+    use SerializeToIso8601;
 
     protected $fillable = [
         'name',
 
@@ -6,6 +6,7 @@
 use Illuminate\Validation\Rule;
 use ProcessMaker\Nayra\Contracts\Engine\ExecutionInstanceInterface;
 use ProcessMaker\Nayra\Engine\ExecutionInstanceTrait;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Represents an Eloquent model of a Request which is an instance of a Process.
@@ -50,6 +51,7 @@ class ProcessRequest extends Model implements ExecutionInstanceInterface
 {
 
     use ExecutionInstanceTrait;
+    use SerializeToIso8601;
 
     /**
      * The attributes that aren't mass assignable.
 
@@ -5,6 +5,7 @@
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Validation\Rule;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Class Screen
@@ -37,6 +38,7 @@
  */
 class Screen extends Model
 {
+    use SerializeToIso8601;
 
     protected $casts = [
         'config' => 'array'
 
@@ -5,6 +5,7 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Validation\Rule;
 use ProcessMaker\Models\Screen;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Represents a business screen category definition.
@@ -29,7 +30,8 @@
  * )
  */
 class ScreenCategory extends Model
-{    
+{
+    use SerializeToIso8601;
 
     protected $fillable = [
         'name',
 
@@ -6,6 +6,7 @@
 use Illuminate\Validation\Rule;
 use ProcessMaker\Models\EnvironmentVariable;
 use ProcessMaker\Exception\ScriptLanguageNotSupported;
+use ProcessMaker\Traits\SerializeToIso8601;
 
 /**
  * Represents an Eloquent model of a Script
@@ -36,6 +37,7 @@
  */
 class Script extends Model
 {
+    use SerializeToIso8601;
 
     protected $guarded = [
         'id',
 
@@ -7,6 +7,7 @@
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 
+use ProcessMaker\Traits\SerializeToIso8601;
 use Spatie\MediaLibrary\HasMedia\HasMedia;
 use Spatie\MediaLibrary\HasMedia\HasMediaTrait;
 use ProcessMaker\Traits\HasAuthorization;
@@ -17,6 +18,7 @@ class User extends Authenticatable implements HasMedia
     use Notifiable;
     use HasMediaTrait;
     use HasAuthorization;
+    use SerializeToIso8601;
 
     //Disk
     public const DISK_PROFILE = 'profile';
 
@@ -0,0 +1,16 @@
+<?php
+namespace ProcessMaker\Traits;
+
+/**
+ * Trait that allows that all dates of an Eloquent model be serialized in ISO 8601 format
+ *
+ * @package ProcessMaker\Traits
+ */
+trait SerializeToIso8601
+{
+    protected function serializeDate(\DateTimeInterface $date)
+    {
+        return $date->format('c');
+    }
+
+}