each-days.js

const { DateTime } = require('luxon')

function eachDays(d1, d2, response = 'DateTime') {
    let parse = (date) => {
        switch(date.constructor) {
            case Date:
                return DateTime.fromJSDate(date).startOf('day')
            case String:
                return DateTime.fromSQL(date).startOf('day')

            case DateTime:
                return date.startOf('day')

            default:
                throw new Error('Invalid Format')
        }
    }

    let format = (date) => {
        switch (response) {
            case 'DateTime':
                return date

            case 'JSDate':
                return date.toJSDate()

            default:
                return date.toFormat(response)
        }
    }

    let d = [d1, d2].map(parse)

    let temp = []
    while (d[0] <= d[1]) {
        temp.push(format(d[0]))
        d[0] = d[0].plus({ days: 1 }).startOf('day')
    }
    return temp
}

exports.eachDays = eachDays