The date field does not work in the Variants tab

Hello,

Because it was your very first message in the forum, you message had to be approved and unfortunately, the information related to your HikaShop version number are lost in the process.
Which HikaShop/Joomla version numbers are you using ?

Regards,

Hello,

Okay ; but please understand that when we are asking for a version number we are expecting to get a version number and not just the word "latest".
You can find Joomla 3.8, 3.9 and 4.0 development branches ; you can find a Joomla "master" branch. And you can find releases.

Now about the issue, some modification in the Joomla calendar during the 3.7.2 release break how the calendar can be initialized in Ajax ; that new calendar is still unstable since his refactoring and we already submitted some reports about B/C.
Right now, the easier would be to update the "product / variant" view to add such code at the very end:

?>
<script type="text/javascript">
if(JoomlaCalendar && JoomlaCalendar.init){
	setTimeout(function(){
		var section = document.getElementById('hikashop_product_variant_edition');
		elements = section.querySelectorAll(".field-calendar");
		for(i = 0; i < elements.length; i++){
			JoomlaCalendar.init(elements[i]);
		}
	}, 500);
}
</script>