Get the timestamp of 0:00 and 23:59 of the current date

1. Get today 0 Time stamp ：

const start = new Date(new Date(new Date().toLocaleDateString()).getTime());       // If it's not the same day, you want to get 0 Point time .
console.log(start); 

2. Get today 23:59:59 Time stamp ：

const start = new Date(new Date(new Date().toLocaleDateString()).getTime()+24*60*60*1000-1);
console.log(start);