index.js 2.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748
  1. import toDate from "../toDate/index.js";
  2. import requiredArgs from "../_lib/requiredArgs/index.js";
  3. /**
  4. * @name parseJSON
  5. * @category Common Helpers
  6. * @summary Parse a JSON date string
  7. *
  8. * @description
  9. * Converts a complete ISO date string in UTC time, the typical format for transmitting
  10. * a date in JSON, to a JavaScript `Date` instance.
  11. *
  12. * This is a minimal implementation for converting dates retrieved from a JSON API to
  13. * a `Date` instance which can be used with other functions in the `date-fns` library.
  14. * The following formats are supported:
  15. *
  16. * - `2000-03-15T05:20:10.123Z`: The output of `.toISOString()` and `JSON.stringify(new Date())`
  17. * - `2000-03-15T05:20:10Z`: Without milliseconds
  18. * - `2000-03-15T05:20:10+00:00`: With a zero offset, the default JSON encoded format in some other languages
  19. * - `2000-03-15T05:20:10+05:45`: With a positive or negative offset, the default JSON encoded format in some other languages
  20. * - `2000-03-15T05:20:10+0000`: With a zero offset without a colon
  21. * - `2000-03-15T05:20:10`: Without a trailing 'Z' symbol
  22. * - `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
  23. * - `2000-03-15 05:20:10`: With a space instead of a 'T' separator for APIs returning a SQL date without reformatting
  24. *
  25. * For convenience and ease of use these other input types are also supported
  26. * via [toDate]{@link https://date-fns.org/docs/toDate}:
  27. *
  28. * - A `Date` instance will be cloned
  29. * - A `number` will be treated as a timestamp
  30. *
  31. * Any other input type or invalid date strings will return an `Invalid Date`.
  32. *
  33. * @param {String|Number|Date} argument A fully formed ISO8601 date string to convert
  34. * @returns {Date} the parsed date in the local time zone
  35. * @throws {TypeError} 1 argument required
  36. */
  37. export default function parseJSON(argument) {
  38. requiredArgs(1, arguments);
  39. if (typeof argument === 'string') {
  40. var parts = argument.match(/(\d{4})-(\d{2})-(\d{2})[T ](\d{2}):(\d{2}):(\d{2})(?:\.(\d{0,7}))?(?:Z|(.)(\d{2}):?(\d{2})?)?/);
  41. if (parts) {
  42. // Group 8 matches the sign
  43. 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)));
  44. }
  45. return new Date(NaN);
  46. }
  47. return toDate(argument);
  48. }