let s = '12:45:54PM';
const time = s.split(':');
const hour = s.indexOf('PM') > 0 ? Number(time[0]) === 12 ? time[0] : Number(time[0]) + 12 : ( Number(time[0]) === 12 ? Number(time[0]) - 12 : time[0]);
s = (hour + ':' + time[1] + ':' + time[2]);
console.log(s)
const d = new Date('1/1/2020 '+ s.replace('AM', '').replace('PM', ''));
const timeOptions = {
hourCycle: 'h23',
hour: '2-digit',
minute: '2-digit',
second: '2-digit'
};
const formatter = new Intl.DateTimeFormat('pt-BR', timeOptions);
//console.log(formatter.format(d))
