I can't access your site with provided account in another topic.
You can backup and edit this file: /components/com_jamegafilter/assets/js/main.js
Look for this snippet of code:
if (value.type == 'date') {
_date = new Date(value.frontend_value[0] * 1000);
_value = _date.getFullYear() + '-' + (_date.getMonth() + 1) + '-' + _date.getDate();
} else if (value.type == 'color') {
change it to:
if (value.type == 'date') {
_date = new Date(value.frontend_value[0] * 1000);
const monthNames = [
'January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'
];
_value = _date.getDate() + ' ' + monthNames[_date.getMonth()] + ' ' + _date.getFullYear();
} else if (value.type == 'color') {