@entestat/formula/silk/LocalDate.js

fast excel formula parser

const moment = require('moment-timezone');

const format = /^\d{4}-\d{2}-\d{2}$/
function pad(num, size) {
    var s = "000" + num;
    return s.substr(s.length-size);
}

class LocalDate{
    /**
     * @param year {number?}
     * @param month {number?}
     * @param day {number?}
     */
    constructor(year, month, day) {

        /** @type {string} format: 2021-01-29*/
        this.value = null;

        if(year !== undefined && month !== undefined && day !== undefined){
            this.set(year, month, day);
        }
    }
    asMoment(){
        return moment(this.value);
    }

    _getPos(start, end){
        if(this.value === null){
            return null;
        }
        if(!this.value.match(format)){
            return null;
        }
        return Number(this.value.substring(start,end));

    }
    getYear(){
        return this._getPos(0, 4);
    }

    getMonth(){
        return this._getPos(5, 7);
    }

    getDay(){
        return this._getPos(8, 10);
    }

    toJSON(){
        return this.value;
    }

    fromMoment(momentDate){
        this.set(momentDate.year(), momentDate.month() + 1, momentDate.date());
        return this;
    }

    set(year, month, day){
        this.value = pad(year, 4) + "-" + pad(month, 2) + "-" + pad(day, 2);
        let x =5;
    }

    toString(format){
        if(this.value){
            return moment(this.value).format(format);
        }
        else{
            return '';
        }
    }
}

module.exports = {LocalDate}