Luxon fails to parse ISO 8601 date with 'Z' suffix as UTC

[BenjaminHofstetter]

Describe the bug When using Luxon's DateTime.fromISO() function with the string '2023-12-04Z', the date is parsed as invalid.

To Reproduce Minimal code example:

const { DateTime } = require('luxon');
const date = DateTime.fromISO('2023-12-04Z');
console.log(date.isValid); // false

Actual vs Expected behavior Expected behavior: The date '2023-12-04Z' should be parsed as a valid date. Actual behavior: Luxon parses '2023-12-04Z' as an invalid date.

Desktop (please complete the following information):

• OS: MacOs
• Browser 122.0.6261.94 (
• Luxon version 3.4.4
• Your timezone CET

Additional context This issue occurs when attempting to parse ISO 8601 dates with Luxon. The 'Z' suffix indicates that the date is in UTC time, and it should be parsed correctly.

[diesieben07]

You can only specify an offset if you also specify a time. Just a date plus offset is not valid in ISO 8601.