Problem With Variables on Hana Studio

Hi experts,

I'm having trouble to create a Variable on Hana Studio, and I realy need some help.

Well, first, I'm using ECC on Hana, so there is no BW on it, and Design Studio is plugged directly on Hana, so, there is no IDT too. My version of Hana Is SP8.

What I need to do is a Variable so I filter a Date Field, I need to filter every data with a date before today ( < actual day).

I tried a lot of things but none worked.

Thanks.