Answers for "javascript date with yesterday last month"

js date of yesterday

let today = new Date();
let yesterday = new Date();

yesterday.setDate(today.getDate() - 1);

console.log('Today: ' + today);
console.log('Yesterday: ' + yesterday);

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();