datetimes/src/expressions/DayExpression.js

Extend class of Date

function DayExpression(dateRx, length, date, language) {
    Expresion.call(this, dateRx, length, date, language);

    this.oneDigit = oneDigit;
    this.twoDigit = twoDigit;
    this.threeDigit = threeDigit;
    this.fourDigit = fourDigit;
    this.otherDigit = null;

    function oneDigit(input) {
        return input.replace(this.dateRx, this.date.getDate().toString());
    }

    function twoDigit(input) {
        return input.replace(this.dateRx, this.date.getDate().toString().padStart(2, '0'));
    }

    function threeDigit(input) {
        return input.replace(this.dateRx, this.language.days[this.date.getDay()].substr(0,3));
    }

    function fourDigit(input) {
        return input.replace(this.dateRx, this.language.days[this.date.getDay()]);
    }
}