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 王天杨
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/**
* @name parseJSON
* @category Common Helpers
* @summary Parse a JSON date string
*
* @description
* Converts a complete ISO date string in UTC time, the typical format for transmitting
* a date in JSON, to a JavaScript `Date` instance.
*
* This is a minimal implementation for converting dates retrieved from a JSON API to
* a `Date` instance which can be used with other functions in the `date-fns` library.
* The following formats are supported:
*
* - `2000-03-15T05:20:10.123Z`: The output of `.toISOString()` and `JSON.stringify(new Date())`
* - `2000-03-15T05:20:10Z`: Without milliseconds
* - `2000-03-15T05:20:10+00:00`: With a zero offset, the default JSON encoded format in some other languages
* - `2000-03-15T05:20:10+05:45`: With a positive or negative offset, the default JSON encoded format in some other languages
* - `2000-03-15T05:20:10+0000`: With a zero offset without a colon
* - `2000-03-15T05:20:10`: Without a trailing 'Z' symbol
* - `2000-03-15T05:20:10.1234567`: Up to 7 digits in milliseconds field. Only first 3 are taken into account since JS does not allow fractional milliseconds
* - `2000-03-15 05:20:10`: With a space instead of a 'T' separator for APIs returning a SQL date without reformatting
*
* For convenience and ease of use these other input types are also supported
* via [toDate](https://date-fns.org/docs/toDate):
*
* - A `Date` instance will be cloned
* - A `number` will be treated as a timestamp
*
* Any other input type or invalid date strings will return an `Invalid Date`.
*
* @param dateStr - A fully formed ISO8601 date string to convert
*
* @returns The parsed date in the local time zone
*/
export function parseJSON(dateStr) {
const parts = dateStr.match(
/(\d{4})-(\d{2})-(\d{2})[T ](\d{2}):(\d{2}):(\d{2})(?:\.(\d{0,7}))?(?:Z|(.)(\d{2}):?(\d{2})?)?/,
);
if (parts) {
// Group 8 matches the sign
return new Date(
Date.UTC(
+parts[1],
+parts[2] - 1,
+parts[3],
+parts[4] - (+parts[9] || 0) * (parts[8] == "-" ? -1 : 1),
+parts[5] - (+parts[10] || 0) * (parts[8] == "-" ? -1 : 1),
+parts[6],
+((parts[7] || "0") + "00").substring(0, 3),
),
);
}
return new Date(NaN);
}
// Fallback for modularized imports:
export default parseJSON;
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