is it safe to run echo formatted datetime in php in terms of xss attack?

Short: Yes. If your value wouldn’t be a date, it would just cause an error:

$d=new DateTime (" <script> malicious </script>");
echo $d->format("y");
/*will cause something like 
Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string ( <script> malicious </script>)*/

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