I have a string to parse into Date
const a = '18122122'
and this way(constantly using substr) to parse it is ugly and error-prone
const date = new Date('20' + a.substr(0, 2), a.substr(2, 2) - 1, a.substr(4, 2), a.substr(6,2 ))
Do I miss a method like
const dateArray = a.<method>(2) // return ['18', '12', '21', '22']
dateArray[0] = '20' + dateArray[0]
dateArray[1] -= 1;
const date = new Date(...dateArray)
You can use a global regular expression to match repeated instances of 2 digits, and then replace the array items as needed:
const a = '18122122';
const dateArray = a.match(/\d{2}/g);
dateArray[0] = '20' + dateArray[0];
dateArray[1] -= 1;
const date = new Date(...dateArray);
console.log(date);
Try:
const a = "18042019";
let [, day, month, year] = a.match(/^(\d{2})(\d{2})(\d{4})/);
new Date(year, --month, day);
It doesn't matter that the Date arguments are strings containing numbers, as the constructor will typecast each parameter to a Number anyway.