skeeks\cms\models\User::isPasswordResetTokenValid PHP Method

    public static function isPasswordResetTokenValid($token)
    {
        if (empty($token)) {
            return false;
        }
        $expire = Yii::$app->cms->passwordResetTokenExpire;
        $parts = explode('_', $token);
        $timestamp = (int) end($parts);
        return $timestamp + $expire >= time();
    }

 /**
  * Sends an email with a link, for resetting the password.
  *
  * @return boolean whether the email was send
  */
 public function sendEmail()
 {
     /* @var $user User */
     if ($user = User::findByEmail($this->email)) {
         if (!User::isPasswordResetTokenValid($user->password_reset_token)) {
             $user->generatePasswordResetToken();
         }
         if ($user->save()) {
             \Yii::$app->mailer->view->theme->pathMap = ArrayHelper::merge(\Yii::$app->mailer->view->theme->pathMap, ['@app/mail' => ['@skeeks/cms/mail']]);
             return \Yii::$app->mailer->compose('@app/mail/password-reset-token', ['user' => $user])->setFrom([\Yii::$app->cms->adminEmail => \Yii::$app->cms->appName . ' robot'])->setTo($this->email)->setSubject(\Yii::t('skeeks/cms', 'Password reset for ') . \Yii::$app->cms->appName)->send();
         }
     }
     return false;
 }