A simple way to calculate date ranges start and end suitable for date fields

date-range.js

var DateRange = {
    today: function(){
        var currentDay = new Date();
        var date = currentDay.getFullYear() + '-' + this.addZero(parseInt(currentDay.getMonth() + 1)) + '-' + this.addZero(currentDay.getDate());
        return {from: date, to: date};
    },
    yesterday: function() {
        var dayBefore = new Date();
        dayBefore.setDate(dayBefore.getDate() - 1);
        var date = dayBefore.getFullYear() + '-' + this.addZero(parseInt(dayBefore.getMonth() + 1)) + '-' + this.addZero(dayBefore.getDate());
        return {from: date, to: date};
    },
    currentWeek: function(){
        var weekStart = new Date();
        var diff = weekStart.getDay();
        weekStart.setDate(weekStart.getDate() - diff);
        var weekStartDate = weekStart.getFullYear() + '-' + this.addZero(parseInt(weekStart.getMonth() + 1)) + '-' + this.addZero(weekStart.getDate());

        var currentDay = new Date();
        var date = currentDay.getFullYear() + '-' + this.addZero(parseInt(currentDay.getMonth() + 1)) + '-' + this.addZero(currentDay.getDate());

        return {from: weekStartDate, to: date};
    },
    lastWeek: function(){
        var weekStart = new Date();
        var diff = weekStart.getDay();
        weekStart.setDate(weekStart.getDate() - diff - 7);
        var weekStartDate = weekStart.getFullYear() + '-' + this.addZero(parseInt(weekStart.getMonth() + 1)) + '-' + this.addZero(weekStart.getDate());

        var weekEnd = new Date();
        weekEnd.setDate(weekEnd.getDate() - 3 - diff);
        var weekEndDate = weekEnd.getFullYear() + '-' + this.addZero(parseInt(weekEnd.getMonth() + 1)) + '-' + this.addZero(weekEnd.getDate());

        return {from: weekStartDate, to: weekEndDate};
    },
    lastMonth: function(){
        var monthStart = new Date();
        monthStart.setMonth(monthStart.getMonth() - 1);
        var monthStartDate = monthStart.getFullYear() + '-' + this.addZero(parseInt(monthStart.getMonth() + 1)) + '-01';

        var monthEnd = new Date();
        monthEnd.setDate(0);
        var monthEndDate = monthEnd.getFullYear() + '-' + this.addZero(parseInt(monthEnd.getMonth() + 1)) + '-' + this.addZero(monthEnd.getDate());

        return {from: monthStartDate, to: monthEndDate}
    },
    currentMonth: function(){
        var monthStart = new Date();
        var monthStartDate = monthStart.getFullYear() + '-' + this.addZero(parseInt(monthStart.getMonth() + 1)) + '-01';

        var currentDay = new Date();
        var date = currentDay.getFullYear() + '-' + this.addZero(parseInt(currentDay.getMonth() + 1)) + '-' + this.addZero(currentDay.getDate());

        return {from: monthStartDate, to: date};
    },
    addZero: function(i){
        if (i < 10) {
            return '0' + i;
        }

        return i;
    }
};

module.exports = DateRangeCalculator;

// TODO: Add unit testing
// TODO: Create a package