locutus/php/datetime/idate.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.idate = idate;
function idate(format, timestamp) {
    //      discuss at: https://locutus.io/php/idate/
    // parity verified: PHP 8.3
    //     original by: Brett Zamir (https://brett-zamir.me)
    //     original by: date
    //     original by: gettimeofday
    //        input by: Alex
    //     bugfixed by: Brett Zamir (https://brett-zamir.me)
    //     improved by: Theriault (https://github.com/Theriault)
    //       example 1: idate('y', 1255633200)
    //       returns 1: 9
    if (format === undefined) {
        throw new Error('idate() expects at least 1 parameter, 0 given');
    }
    if (!format.length || format.length > 1) {
        throw new Error('idate format is one char');
    }
    // @todo: Need to allow date_default_timezone_set() (check for $locutus.default_timezone and use)
    const _date = typeof timestamp === 'undefined'
        ? new Date()
        : timestamp instanceof Date
            ? new Date(timestamp.getTime())
            : new Date(Number(timestamp) * 1000);
    let a;
    switch (format) {
        case 'B':
            return (Math.floor((_date.getUTCHours() * 36e2 + _date.getUTCMinutes() * 60 + _date.getUTCSeconds() + 36e2) / 86.4) %
                1e3);
        case 'd':
            return _date.getDate();
        case 'h':
            return _date.getHours() % 12 || 12;
        case 'H':
            return _date.getHours();
        case 'i':
            return _date.getMinutes();
        case 'I':
            // capital 'i'
            // Logic original by getimeofday().
            // Compares Jan 1 minus Jan 1 UTC to Jul 1 minus Jul 1 UTC.
            // If they are not equal, then DST is observed.
            a = _date.getFullYear();
            return Number(new Date(a, 0).getTime() - Date.UTC(a, 0) !== new Date(a, 6).getTime() - Date.UTC(a, 6));
        case 'L':
            a = _date.getFullYear();
            return !(a & 3) && (a % 1e2 || !(a % 4e2)) ? 1 : 0;
        case 'm':
            return _date.getMonth() + 1;
        case 's':
            return _date.getSeconds();
        case 't':
            return new Date(_date.getFullYear(), _date.getMonth() + 1, 0).getDate();
        case 'U':
            return Math.round(_date.getTime() / 1000);
        case 'w':
            return _date.getDay();
        case 'W': {
            const weekDate = new Date(_date.getFullYear(), _date.getMonth(), _date.getDate() - (_date.getDay() || 7) + 3);
            return 1 + Math.round((weekDate.getTime() - new Date(weekDate.getFullYear(), 0, 4).getTime()) / 864e5 / 7);
        }
        case 'y':
            return parseInt((_date.getFullYear() + '').slice(2), 10); // This function returns an integer, unlike _date()
        case 'Y':
            return _date.getFullYear();
        case 'z':
            return Math.floor((_date.getTime() - new Date(_date.getFullYear(), 0, 1).getTime()) / 864e5);
        case 'Z':
            return -_date.getTimezoneOffset() * 60;
        default:
            throw new Error('Unrecognized _date format token');
    }
}