typescript - get the day name from a date

Question

I tried to get the day name from a date, but with the date 27/02/2021 i get Invalid Date

new Date(exam.examDate).toLocaleString('fr-FR', { weekday: 'long' })

i tried to convert the date using datePipe but it return the below error

Unable to convert "27/02/2021" into a date' for pipe 'DatePipe

new Date(this.datePipe.transform(exam.examDate, "dd/MM/yyyy")).toLocaleString('fr-FR', { weekday: 'long' })

Answer 1

You can get a custom day name from Date like:

const names = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
const dayName = names[dateObject.getDay()];

const date = '27/02/2021';
const d = date.split('/');
const names = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
const dayName = names[new Date(d[2],d[1],d[0]).getDay()];
console.log(dayName);

Answer 2

examDate = "27/02/2021";
date = examDate.split("/");
x = new Date(date[2], date[1] - 1, date[0]);

// it prints "samedi"
console.log(x.toLocaleString('fr-FR', { weekday: 'long' }));

Answer 3

This is because Date expects MM/DD/YYYY but you're passing DD/MM/YYYY:

const getDay = date => {
  const parts = date.split('/');
  return new Date(+parts[2], +parts[1] - 1, +parts[0]).toString().split(' ')[0]; 
}

console.log( getDay('27/02/2021') );

Using moment.js:

const getDay = date =>
  moment(date, "DD/MM/YYYY").format('ddd');

console.log( getDay('27/02/2021') );

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