10 examples of 'javascript get timezone offset for specific timezone' in JavaScript

50
offset(ts) {
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  return -new Date(ts).getTimezoneOffset();
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}

30
function getTimeZone(tz) {
31
    return (tz == null) ? -new Date().getTimezoneOffset() : tz;
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}

6
function timezoneAbbr(date){
7
    // Date.toString gives different results depending on the
8
    // browser/system so we fallback to timezone offset
9
    // chrome: 'Mon Apr 08 2013 09:02:04 GMT-0300 (BRT)'
10
    // IE: 'Mon Apr 8 09:02:04 UTC-0300 2013'
11
    var tz = /\(([A-Z]{3,4})\)/.exec(date.toString());
12
    return tz? tz[1] : timezoneOffset(date);
13
}

49
function timeZoneGetter(date) {
50
    var zone = -1 * date.getTimezoneOffset();
51
    var paddedZone = (zone >= 0) ? "+" : "";
52
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    paddedZone += padNumber(Math[zone > 0 ? 'floor' : 'ceil'](zone / 60), 2) +
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        padNumber(Math.abs(zone % 60), 2);
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    return paddedZone;
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}

113
function timeZoneName(date) {
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    var result = /\((.*)\)/.exec(date.toString());
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    var language;
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    if (this.navigator != null) {
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        language = this.navigator.userLanguage || this.navigator.language;
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    }
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    if (result && result.length > 1) {
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        return result[1];
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    } else {
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        if (language === undefined) {
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            return null;
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        }
127
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        // Try 2nd way, using the locale string, this does not work in Safari (26.07.2016)
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        try {
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            var localeString = date.toLocaleString(language, { timeZoneName: "short" });
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            result = localeString.split(" ");
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            return result[result.length - 1];
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        } catch (e) {
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            return null;
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        }
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    }
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}

1867
tzOffset: function tzOffset(date) {
1868
  return date.getTimezoneOffset() * 60 * 1000;
1869
},

60
function browserTimezone() {
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    var tzMatch = /.+\(([A-Z]+)\)/.exec(new Date().toString());
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    return tzMatch[1] || "";
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}

1
function getUTCOffset() {
2
    // This gives us our UTC offset in minutes, but negative.
3
    var tz_offset = (new Date()).getTimezoneOffset();
4
    var logstr = " ** getUTCOffset(): minutes=" + tz_offset;
5
6
    var is_negative = true;  // Reversed, because we have an offset in the wrong direction.
7
    if (tz_offset < 0) {
8
        is_negative = false;
9
        tz_offset *= -1;
10
    }
11
12
    // Now we have a positive offset, which is much nicer to work with.
13
    var offset_minutes = tz_offset % 60;
14
    var offset_hours = (tz_offset - offset_minutes) / 60;
15
    var offset_number = (offset_hours * 100) + offset_minutes;
16
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    // Make a string with zero padding.
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    var offset_str = offset_number.toString();
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    if (offset_str.length == 3) {
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        offset_str = "0" + offset_str;
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    }
22
23
    if (is_negative) {
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        offset_str = "-" + offset_str;
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    } else {
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        offset_str = "+" + offset_str;
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    }
28
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    console.log(logstr + " offset_str='" + offset_str + "'");
30
    return offset_str;
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}

88
function getTimezoneOffset() {
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    var offset = new Date().getTimezoneOffset();
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    var minutes = Math.abs(offset);
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    var hours = Math.floor(minutes / 60);
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    var prefix = offset < 0 ? "+" : "-";
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    return prefix + hours;
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}

30
function stdTimezoneOffset (date) {
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    var jan = new Date(date.getFullYear(), 0, 20);
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    var jul = new Date(date.getFullYear(), 6, 20);
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    return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
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}