@amcharts/amcharts5/.internal/core/util/Timezone.js

amCharts 5

function parseDate(timezone, date) {
    let year = 0;
    let month = 0;
    let day = 1;
    let hour = 0;
    let minute = 0;
    let second = 0;
    let millisecond = 0;
    let weekday = 0;
    timezone.formatToParts(date).forEach((x) => {
        switch (x.type) {
            case "year":
                year = +x.value;
                break;
            case "month":
                month = (+x.value) - 1;
                break;
            case "day":
                day = +x.value;
                break;
            case "hour":
                hour = +x.value;
                break;
            case "minute":
                minute = +x.value;
                break;
            case "second":
                second = +x.value;
                break;
            case "fractionalSecond":
                millisecond = +x.value;
                break;
            case "weekday":
                switch (x.value) {
                    case "Sun":
                        weekday = 0;
                        break;
                    case "Mon":
                        weekday = 1;
                        break;
                    case "Tue":
                        weekday = 2;
                        break;
                    case "Wed":
                        weekday = 3;
                        break;
                    case "Thu":
                        weekday = 4;
                        break;
                    case "Fri":
                        weekday = 5;
                        break;
                    case "Sat":
                        weekday = 6;
                        break;
                }
        }
    });
    if (hour === 24) {
        hour = 0;
    }
    return { year, month, day, hour, minute, second, millisecond, weekday };
}
function toUTCDate(timezone, date) {
    const { year, month, day, hour, minute, second, millisecond } = parseDate(timezone, date);
    return Date.UTC(year, month, day, hour, minute, second, millisecond);
}
export class Timezone {
    constructor(timezone, isReal) {
        if (!isReal) {
            throw new Error("You cannot use `new Class()`, instead use `Class.new()`");
        }
        this.name = timezone;
        this._utc = new Intl.DateTimeFormat("en-US", {
            hour12: false,
            timeZone: "UTC",
            year: "numeric",
            month: "2-digit",
            day: "2-digit",
            hour: "2-digit",
            minute: "2-digit",
            second: "2-digit",
            weekday: "short",
            fractionalSecondDigits: 3,
        });
        this._dtf = new Intl.DateTimeFormat("en-US", {
            hour12: false,
            timeZone: timezone,
            year: "numeric",
            month: "2-digit",
            day: "2-digit",
            hour: "2-digit",
            minute: "2-digit",
            second: "2-digit",
            weekday: "short",
            fractionalSecondDigits: 3,
        });
    }
    /**
     * Use this method to create an instance of this class.
     *
     * @see {@link https://www.amcharts.com/docs/v5/getting-started/#New_element_syntax} for more info
     * @param   timezone  IANA timezone
     * @return            Instantiated object
     */
    static new(timezone) {
        return (new this(timezone, true));
    }
    convertLocal(date) {
        const offset = this.offsetUTC(date);
        const userOffset = date.getTimezoneOffset();
        const output = new Date(date);
        output.setUTCMinutes(output.getUTCMinutes() - (offset - userOffset));
        const newUserOffset = output.getTimezoneOffset();
        if (userOffset != newUserOffset) {
            output.setUTCMinutes(output.getUTCMinutes() + newUserOffset - userOffset);
        }
        return output;
    }
    offsetUTC(date) {
        const utc = toUTCDate(this._utc, date);
        const dtf = toUTCDate(this._dtf, date);
        return (utc - dtf) / 60000;
    }
    parseDate(date) {
        return parseDate(this._dtf, date);
    }
}
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