How to compare date string using javascript

Question

I have the following string value of a date, Sun Apr 07 2019 00:00:00 GMT-0300, and I need to compare with the following date form

Answer 1

Build a date from the strings and compare the days (ie number of seconds since epoch / number of seconds in a day):

const sameDay = (dateString1, dateString2) => {
  let time1 = (new Date(dateString1)).getTime();
  let time2 = (new Date(dateString2)).getTime();
  return Math.floor(Math.abs((time1-time2))/(1000*60*60*24))==0;
}

console.log(
  sameDay('Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)','2019-04-08T03:00:00.000Z'),
  sameDay('Sun Apr 07 2019 00:00:00 GMT-0300 (Horário Padrão de Brasília)','2019-04-13T03:00:00.000Z'),
);