Я не могу отправить Excel на сервер с помощью Angular 2

# --------------------
# METHOD 1
# --------------------
# set locale first
setlocale (LC_TIME, 'fr_FR.utf8','fra'); 
// setlocale(LC_TIME, 'fr_FR.UTF8');
// setlocale(LC_TIME, 'fr_FR');
// setlocale(LC_TIME, 'fr');
// setlocale(LC_TIME, 'fra_fra');
# Examples using current time
echo strftime('%Y-%m-%d %H:%M:%S');  // 2015-03-02 17:58:50
echo strftime('%A %d %B %Y, %H:%M'); // lundi 02 mars 2015, 17:58
echo strftime('%d %B %Y');           // 02 mars 2015
echo strftime('%d/%m/%y');           // 02/03/15
# Example with given timestamp
$timestamp = time () ; // Any timestamp will do
echo strftime( "%d %B %Y", $timestamp ) ;  // 02 mars 2015

# --------------------
# METHOD 2 
# --------------------
# using arrays without setting the locale ( not recommanded )
$day = array("Dimanche","Lundi","Mardi","Mercredi","Jeudi","Vendredi","Samedi"); 
$month = array("janvier", "février", "mars", "avril", "mai", "juin", "juillet", "août", "septembre", "octobre", "novembre", "décembre"); 
// Now
$date = explode('|', date("w|d|n|Y"));
// Given time
$timestamp = time () ;
$date = explode('|', date( "w|d|n|Y", $timestamp ));
echo $day[$date[0]] . ' ' . $date[1] . ' ' . $month[$date[2]-1] . ' ' . $date[3] ; // Lundi 02 mars 2015