Yes I read all those threads, before I set this question.
When I add custom field to the widget with “st_date” as Meta Key and set it for example as Radio Button. With comparative method “equal” (=) and set some valid start date it works, and found my events with this date.
But when the comparative method is (>=) and (<=) it didn’t found anything.
And when I’m trying to use some of methods described earlier in this support forum, it found nothing, it’s searching only in post created dates not in meta data.
Dates in saved as “date” data type, so they are in standard format, they are not strings, or something.
So is there any way how could I set “from” – “to” filter?