Hide chat link if before 9am or after 5pm. And hide all day Saturday and Sunday.

chat-business-hours-weekday-only.txt

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<script>
$(function() {
 var inBusinessHours = false;
var m = moment.utc().subtract('hours', 6);
/* Use 8 and 18 for 8am to 6pm */
if (m.hours() >= 8 && m.hours() < 19 && m.format('dddd') != "Saturday" && m.format('dddd') != "Sunday") {
inBusinessHours = true;
}
if (inBusinessHours) {
$(".chat-link").show();
}
});
</script>

What do you mean : “.chat-link” ?

.chat-link is referencing the class on the link tag. You can name the class anything you want though.