Hi Ashutosh,
You can try something like:
The following example demonstrates the incrementation of the date value 2009-12-05 by 30 days.
SELECT ADD_DAYS (TO_DATE ('2009-12-05', 'YYYY-MM-DD'), 30) "add days" FROM DUMMY;
for more details about date functions, please check the below link: https://help.sap.com/saphelp_hanaplatform/helpdata/en/20/da5fa8751910148969da2572b25ed8/content.htm
Thanks & Regards
A.Dinesh