var d = new Date("2020-04-13T00:00:00.000+08:00"); /* midnight in China on April 13th */
d.toLocaleString('en-US', { timeZone: 'America/New_York' });
//=> "4/12/2020, 12:00:00 PM"
// (midnight in China on April 13th is noon in New York on April 12th)function utcConverterToLocalTimezone(fechaUTC) {
const localTimezone = fechaUTC
.toLocaleString({ timeZone: "America/Guayaquil" })
.split(" ");
const diamesaño = localTimezone[0].split("/");
let dia = diamesaño[0];
let mes = diamesaño[1];
const año = diamesaño[2];
const hora = localTimezone[1];
dia < 10 ? (dia = `${0}${dia}`) : null;
mes < 10 ? (mes = `${0}${mes}`) : null;
const fechaFinalFormateada = `${año}-${mes}-${dia}T${hora}-05:00`;
return fechaFinalFormateada;
}
console.log(utcConverterToLocalTimezone(new Date("2021-08-12T03:46:00.000+00:00")));