How to use LEAD and LAG functions in SAP HANA Graphical Modeling?

Hi,

I have to calculate the difference between two date & times from 2 different rows i.e. difference from current row date to previous row date.

I can able to calculate this in SQL Script (Procedure or Function or SQL Calculation View) but i'm not able to find any function in Graphical Modeling.

Can anyone suggest me how to solve the above issue.

Regards,

Ramana.