Displaying user’s computer’s date and time NOT server datetime

This sounded straightforward at first, I had to display the user’s date and time on an online web report. And from searching online, seems it can only be done in Javascript. Here is the code:
var months = new MonthArray(‘Jan’,‘Feb’,‘Mar’,‘Apr’,‘May’,‘Jun’,‘Jul’,‘Aug’,‘Sep’,‘Oct’,‘Nov’,‘Dec’);
var vUsersDate = new Date();
var day = vUsersDate.getDate();
var mon = vUsersDate.getMonth() + 1;
var year = vUsersDate.getYear();
var hour = vUsersDate.getHours();
var [...]