bigmuffx

Thank you! Appreciate your job!

Working perfectly, thank you!

Solved installing the following modules on my server (running CentOS):

sudo yum install php-gd

sudo yum install php-xml
sudo yum install php-xmlrpc

I solved this problem using email template override deleting the S from the date format jS F Y in this string of every template email order:

echo date_i18n( __( 'jS F Y', 'woocommerce' ), strtotime( $order->order_date ) ) . "\n";

Just create a subfolder in your template folder > woocommerce > email > plains and put the relative php file.
I used a child-theme.