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33 lines
1.6 KiB
33 lines
1.6 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $Date = GetIntrinsic('%Date%'); |
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var $TypeError = require('es-errors/type'); |
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var isNaN = require('math-intrinsics/isNaN'); |
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var callBound = require('call-bound'); |
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var $indexOf = callBound('String.prototype.indexOf'); |
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var $slice = callBound('String.prototype.slice'); |
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var $toTimeString = callBound('Date.prototype.toTimeString'); |
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// https://262.ecma-international.org/9.0/#sec-timezoneestring |
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module.exports = function TimeZoneString(tv) { |
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if (typeof tv !== 'number' || isNaN(tv)) { |
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throw new $TypeError('Assertion failed: `tv` must be a non-NaN Number'); // steps 1 - 2 |
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} |
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// 3. Let offset be LocalTZA(tv, true). |
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// 4. If offset ≥ 0, let offsetSign be "+"; otherwise, let offsetSign be "-". |
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// 5. Let offsetMin be the String representation of MinFromTime(abs(offset)), formatted as a two-digit decimal number, padded to the left with a zero if necessary. |
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// 6. Let offsetHour be the String representation of HourFromTime(abs(offset)), formatted as a two-digit decimal number, padded to the left with a zero if necessary. |
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// 7. 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-dependent timezone name, and the code unit 0x0029 (RIGHT PARENTHESIS). |
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// 8. Return the string-concatenation of offsetSign, offsetHour, offsetMin, and tzName. |
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// hack until LocalTZA, and "implementation-defined string" are available |
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var ts = $toTimeString(new $Date(tv)); |
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return $slice(ts, $indexOf(ts, '(') + 1, $indexOf(ts, ')')); |
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};
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