Date issue with different timezone

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Storing dates in to wix database from selected date in the datepicker. Before storing date using below function

function eventDateFormat(edate, etime) {
 var YYYY = edate.getFullYear();
 var M = edate.getMonth();
 var D = edate.getDate();
 // ADD a "TimePicker" control to your page
 var HH = (etime.slice(0, 2));
 var MM = etime.slice(3, 5);
 var datetime = new Date(YYYY, M, D, HH, MM);
 return datetime;
}

In the repeater displaying dates form the database (Format is like E.g:- May 30, 2020)using below function

function dateFormat (dateVal) { 
var month = new Array();
    month[0] = "Jan";
    month[1] = "Feb";
    month[2] = "Mar";
    month[3] = "Apr";
    month[4] = "May";
    month[5] = "Jun";
    month[6] = "Jul";
    month[7] = "Aug";
    month[8] = "Sep";
    month[9] = "Oct";
    month[10] = "Nov";
    month[11] = "Dec";
 let date = new Date(dateVal);
 let day = date.getDate();
 let mm = month[date.getMonth()];
 let year = date.getFullYear();
 let dateStr = mm + " " + day + ", " + year;
 return dateStr;
}

But for india time it displays proper and for other location like US it is showing one day less(E.g:- In india → May 30, 2020, In US → May 29, 2020 and in database it is May 30, 2020 only).

How to fix this problem it should be same date for all location?