51 lines
2.1 KiB
JavaScript
51 lines
2.1 KiB
JavaScript
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import toDate from '../toDate/index.js';
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/**
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* @name parseJSON
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* @category Common Helpers
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* @summary Parse a JSON date string
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*
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* @description
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* Converts a complete ISO date string in UTC time, the typical format for transmitting
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* a date in JSON, to a JavaScript `Date` instance.
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*
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* This is a minimal implementation for converting dates retrieved from a JSON API to
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* a `Date` instance which can be used with other functions in the `date-fns` library.
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* The following formats are supported:
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*
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* - `2000-03-15T05:20:10.123Z`: The output of `.toISOString()` and `JSON.stringify(new Date())`
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* - `2000-03-15T05:20:10Z`: Without milliseconds
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* - `2000-03-15T05:20:10+00:00`: With a zero offset, the default JSON encoded format in some other languages
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* - `2000-03-15T05:20:10+0000`: With a zero offset without a colon
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* - `2000-03-15T05:20:10`: Without a trailing 'Z' symbol
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* - `2000-03-15T05:20:10.134566`: Up to 6 digits in milliseconds field. Only first 3 are taken into account since JS does now allow fractional milliseconds
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*
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* For convenience and ease of use these other input types are also supported
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* via [toDate]{@link https://date-fns.org/docs/toDate}:
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*
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* - A `Date` instance will be cloned
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* - A `number` will be treated as a timestamp
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*
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* Any other input type or invalid date strings will return an `Invalid Date`.
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*
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* @param {String|Number|Date} argument A fully formed ISO1806 date string to convert
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* @returns {Date} the parsed date in the local time zone
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* @throws {TypeError} 1 argument required
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*/
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export default function parseJSON(argument) {
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if (arguments.length < 1) {
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throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
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}
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if (typeof argument === 'string') {
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var parts = argument.match(/(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{0,6}))?(?:Z|\+00:?00)?/);
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if (parts) {
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return new Date(Date.UTC(+parts[1], parts[2] - 1, +parts[3], +parts[4], +parts[5], +parts[6], +((parts[7] || '0') + '00').substring(0, 3)));
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}
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return new Date(NaN);
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}
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return toDate(argument);
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}
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