Vertical line when date change

[Gigi]

I use Jpgraph 4.2.2 and I try to display a variable(Y) in regard to the date/time(X).

I'd like to add a vertical line every time that the date changes (only date, not time). To teste,I have just created 2 arrays, one with dates and one with values. as following

$dates = array("2024-04-17 12:00", "2024-04-17 18:00", "2024-04-17 03:00", "2024-04-18 15:00", "2024-04-19 06:00");

I am waiting that a vertical line appear between 2024-04-17 03:00 and 2024-04-18 15:00

When I create the xaxis, with the lines :

$xaxis = new DateScale();
$xaxis->SetDateFormat('d/m/Y H:i'); // Définir le format de date pour les étiquettes d'axe
$xaxis->SetLabelAngle(90); // Définir l'angle des étiquettes d'axe

I get an error on the 3rd line:

Fatal error: Uncaught Error: Class 'DateScale' not found in /var/www/html/WEB/jpgraph-4.4.2/src/jpgraph.php:1103 Stack trace: #0 /var/www/html/WEB/BBB/test.php(27): Graph->SetScale() #1 {main} thrown in /var/www/html/WEB/jpgraph-4.4.2/src/jpgraph.php on line 1103

Anybody could help me ?