date now yesterday in javascript code example

Example 1: js yesterday date

var yesterday = new Date((new Date()).valueOf() - 1000*60*60*24);

Example 2: javascript beginning of today and yesterday

var start = new Date();
start.setHours(0, 0, 0, 0);
start = start.getTime();

var end = new Date();
end.setHours(0, 0, 0, 0);
end.setDate(end.getDate() + 1);
end = end.getTime();