luxon
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Immutable date wrapper
166 lines (139 loc) • 5.24 kB
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<div class="content" data-ice="content"><h1 data-ice="title">src/zones/IANAZone.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Util } from '../impl/util';
import { Zone } from '../zone';
const typeToPos = {
year: 0,
month: 1,
day: 2,
hour: 3,
minute: 4,
second: 5
};
function hackyOffset(dtf, date) {
const formatted = dtf.format(date),
parsed = /(\d+)\/(\d+)\/(\d+), (\d+):(\d+):(\d+)/.exec(formatted),
[, fMonth, fDay, fYear, fHour, fMinute, fSecond] = parsed;
return [fYear, fMonth, fDay, fHour, fMinute, fSecond];
}
function partsOffset(dtf, date) {
const formatted = dtf.formatToParts(date),
filled = [];
for (let i = 0; i < formatted.length; i++) {
const { type, value } = formatted[i],
pos = typeToPos[type];
if (!Util.isUndefined(pos)) {
filled[pos] = parseInt(value, 10);
}
}
return filled;
}
function isValid(zone) {
try {
new Intl.DateTimeFormat('en-US', { timeZone: zone }).format();
return true;
} catch (e) {
return false;
}
}
/**
* @private
*/
export class IANAZone extends Zone {
static isValidSpecier(s) {
return s && s.match(/[a-z_]+\/[a-z_]+/i);
}
constructor(name) {
super();
this.zoneName = name;
this.valid = isValid(name);
}
get type() {
return 'iana';
}
get name() {
return this.zoneName;
}
get universal() {
return false;
}
offsetName(ts, { format = 'long', locale = 'en-US' } = {}) {
return Util.parseZoneInfo(ts, format, locale || 'en-US', this.zoneName);
}
offset(ts) {
const date = new Date(ts),
dtf = new Intl.DateTimeFormat('en-US', {
hour12: false,
timeZone: this.zoneName,
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit'
}),
[fYear, fMonth, fDay, fHour, fMinute, fSecond] = dtf.formatToParts
? partsOffset(dtf, date)
: hackyOffset(dtf, date),
asUTC = Date.UTC(fYear, fMonth - 1, fDay, fHour, fMinute, fSecond);
let asTS = date.valueOf();
asTS -= asTS % 1000;
return (asUTC - asTS) / (60 * 1000);
}
equals(otherZone) {
return otherZone.type === 'iana' && otherZone.zoneName === this.zoneName;
}
get isValid() {
return this.valid;
}
}
</code></pre>
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