After several attempts I found out that t: does not want the quotes.
“T”: 1580638982883,
Now works.
I thank everyone for the help.
I have this problem at the server. Someone recomended me to insert the follow instructions al the begining of the php file:
<?php header("Access-Control-Allow-Origin: *"); header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1 header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past because the server do not execute the program that is not fired since a browser.