index.js

'use strict';

(function ($global) {
    const __dateTime = {};

    __dateTime.getUnixTimeSec = ($dateTime, $ms = false) => {
        if ('object' === typeof $dateTime && $dateTime instanceof Date) {
            return Math.round($dateTime.getTime() / 1000);
        }

        if ('number' === typeof $dateTime) {
            return $ms ? Math.round($dateTime / 1000) : $dateTime;
        }

        if ('string' === typeof $dateTime) {
            if (!isNaN(Number($dateTime))) {
                return $ms ? Math.round(Number($dateTime) / 1000) : Number($dateTime);
            } else {
                const __tmpVar = Math.round(new Date($dateTime).getTime() / 1000);
                return isNaN(__tmpVar) ? 'Invalid Date' : __tmpVar;
            }
        }

        return 'Invalid Date';
    };

    __dateTime.getDateZeroTime = ($dateTime, $ms = false) => {
        let __thisDateTime;

        if ('object' === typeof $dateTime && $dateTime instanceof Date) {
            __thisDateTime = $dateTime
        }

        if ('number' === typeof $dateTime) {
            __thisDateTime = $ms ? new Date($dateTime) : new Date($dateTime * 1000);
        }

        if ('string' === typeof $dateTime) {
            if (!isNaN(Number($dateTime))) {
                __thisDateTime = $ms ? new Date(Number($dateTime)) : new Date(Number($dateTime) * 1000);
            } else {
                __thisDateTime = new Date($dateTime);
            }
        }

        if ('Invalid Date' === $dateTime.toString()) {
            return 'Invalid Date';
        }

        __thisDateTime.setHours(0);
        __thisDateTime.setMinutes(0);
        __thisDateTime.setSeconds(0);
        __thisDateTime.setMilliseconds(0);

        return __thisDateTime;
    };

    __dateTime.dateAdd = ($date, $days) => {
        $date.setDate($date.getDate() + $days);
        return $date;
    };

    __dateTime.dateDiff = ($start_date, $end_date) => {
        const __one_day = 86400, __one_hour = 3600, __one_min = 60;

        const __start_date = __dateTime.getUnixTimeSec($start_date);

        if ('Invalid Date' === __start_date) {
            return 'Invalid Start Date';
        }

        const __end_date = __dateTime.getUnixTimeSec($end_date);

        if ('Invalid Date' === __end_date) {
            return 'Invalid End Date';
        }

        let __time_value = __start_date - __end_date;

        let {pof, val, days, day, hour, min, sec} = {pof: true, val: 0, days: 0, day: 0, hour: 0, min: 0, sec: 0};

        pof = __time_value < 0;
        val = Math.abs(__time_value);

        const __days = val / __one_day,
            __hour = val % __one_day / __one_hour,
            __min = val % __one_day % __one_hour / __one_min;

        days = __days.toFixed(2);
        day = __days >= 1 ? parseInt(__days) : 0;
        hour = __hour >= 1 ? parseInt(__hour) : 0;
        min = __min >= 1 ? parseInt(__min) : 0;
        sec = val % __one_day % __one_hour % __one_min;

        return {pof, val, days, day, hour, min, sec};
    };

    __dateTime.format = ($date, $pattern = 'YYYY-MM-DD HH:mm:ss') => {
        const functionCall = {
            YYYY: ['getFullYear', 4],
            YY: ['getFullYear', 2],
            MM: ['getMonth', 2, 1],
            DD: ['getDate', 2],
            HH: ['getHours', 2],
            mm: ['getMinutes', 2],
            ss: ['getSeconds', 2],
            ms: ['getMilliseconds', 3]
        };

        function dateFormat($date, $pattern) {
            function findMatch() {
                const matching = /(?=(YYYY|YY|MM|DD|HH|mm|ss|ms))\1([:\/]*)/.exec($pattern);
                if (matching) {
                    const hitTarget = functionCall[matching[1]];
                    const addPrefix = '00' + String($date[hitTarget[0]]() + (hitTarget[2] || 0));
                    const result = addPrefix.slice(-hitTarget[1]) + (matching[2] || '');
                    $pattern = $pattern.replace(matching[0], result);
                    findMatch();
                }
            }

            findMatch();
            return $pattern
        }

        return dateFormat($date, $pattern)
    };


    if ('function' === typeof define && define.amd) {
        define(function () {
            return __dateTime;
        });
    } else if ('object' === typeof exports) {
        module.exports = __dateTime;
    } else {
        $global.__DateTime = __dateTime;
    }
})(this);