'use strict';
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
var $Date = GetIntrinsic('%Date%');
|
var $TypeError = require('es-errors/type');
|
|
var isInteger = require('../helpers/isInteger');
|
|
var callBound = require('call-bind/callBound');
|
|
var $indexOf = callBound('String.prototype.indexOf');
|
var $slice = callBound('String.prototype.slice');
|
var $toTimeString = callBound('Date.prototype.toTimeString');
|
|
// https://262.ecma-international.org/14.0/#sec-timezoneestring
|
|
module.exports = function TimeZoneString(tv) {
|
if (!isInteger(tv)) {
|
throw new $TypeError('Assertion failed: `tv` must be an integral Number');
|
}
|
|
// 1. Let localTimeZone be DefaultTimeZone().
|
// 2. If IsTimeZoneOffsetString(localTimeZone) is true, then
|
// a. Let offsetNs be ParseTimeZoneOffsetString(localTimeZone).
|
// 3. Else,
|
// a. Let offsetNs be GetNamedTimeZoneOffsetNanoseconds(localTimeZone, ℤ(ℝ(tv) × 106)).
|
// 4. Let offset be 𝔽(truncate(offsetNs / 106)).
|
// 5. If offset is +0𝔽 or offset > +0𝔽, then
|
// a. Let offsetSign be "+".
|
// b. Let absOffset be offset.
|
// 6. Else,
|
// a. Let offsetSign be "-".
|
// b. Let absOffset be -offset.
|
// 7. Let offsetMin be ToZeroPaddedDecimalString(ℝ(MinFromTime(absOffset)), 2).
|
// 8. Let offsetHour be ToZeroPaddedDecimalString(ℝ(HourFromTime(absOffset)), 2).
|
// 9. Let tzName be an implementation-defined string that is either the empty String or the string-concatenation of the code unit 0x0020 (SPACE), the code unit 0x0028 (LEFT PARENTHESIS), an implementation-defined timezone name, and the code unit 0x0029 (RIGHT PARENTHESIS).
|
// 10. Return the string-concatenation of offsetSign, offsetHour, offsetMin, and tzName.
|
|
// hack until DefaultTimeZone, IsTimeZoneOffsetString, ParseTimeZoneOffsetString, GetNamedTimeZoneOffsetNanoseconds, and "implementation-defined string" are available
|
var ts = $toTimeString(new $Date(tv));
|
return $slice(ts, $indexOf(ts, '(') + 1, $indexOf(ts, ')'));
|
};
|
