Sapui5 one before day problem

[#1]

var sToday = new Date(); //today// example : 20.12.2017

this.getView().byId("mesaiTbdPicker").setDateValue(sToday); // set today to datepicker //20.12.2017

and I sending this data.But i looking data in abap date looking 1 before day. //19.12.2017

I tried this but not worked;

var sToday = new Date();

sToday = sToday + 1;

Please help.

[junwu]

it may not be a problem, the browser is showing local time, the abap side is showing server time,