Hi @mayarnaldo
Try to formatDateTime expression to yyyy-MM-dd format. Also if you looking for todays date then you may need to look between yyyy-MM-dd 00:00 and yyyy-MM-dd 23:59.
Also you need to use single quotes around the expressions
formatDateTime(utcNow(), 'yyyy-MM-dd 00:00')
formatDateTime(utcNow(), 'yyyy-MM-dd 23:59')