Gerard Alvear Porras 0dc3431168 Preserve negative timezone offsets in date intervals (#9071) ...

* Preserve negative timezone offsets in date intervals

## Summary

- Preserve the sign of ISO 8601 timezone offsets while normalizing date intervals.
- Add regression coverage for a negative offset.

## Why

The previous normalization removed every hyphen, turning `-05:00` into `0500` and parsing the timestamp in the wrong timezone.

* Pad dates before timezone offsets

* Minor test comment and format

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Co-authored-by: Gerard Alvear <gerard.alvear@logiqd.me>
Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

2026-07-23 14:06:27 +02:00

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