Summary Row DataSource and Relative Dates

[pH4Lk0n]

Hello,

I've found strange behavior on ListGrid with RelativeDate filter.
I've set additional DataSource that fetches summary:

listGrid.setSummaryRowDataSource(dsSummary);

ListGrid has date fields and standard filter editor.
After switching from SmartGWT 3.1 to 4.0 summary fetch has different criteria than normal fetch.
Normal fetch provides dates and summary fetch uses RelativeDate. Unfortunately my server side implementation does not use one.
First of all why is there a difference in this criteria?
How can I force to use normal date format?

Best regards