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Comment by ledauphin | Hacker News Reader

the tables agree that microseconds are supported by both standards, but for some reason the Venn Diagram only displays 6-digit fractional seconds under ISO8601. This led me to do some head-scratching until I referenced the table, which seems a lot more comprehensive.

This is extremely cool and useful overall, but unfortunately the Venn Diagram seems to be slightly misleading.

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Hey thanks for pointing this out. Every time this gets posted to HN someone notices something else.

The format you spotted in the Venn diagram was:

    2023-09-01T10:12:07.284307

This is indeed only valid under ISO 8601 since RFC 3339 always requires a timezone.

So the Venn diagram wasn't wrong, but I agree it was misleading.

I've now updated the diagram to add the following format, which is valid under both standards:

    2023-09-01T02:12:07.284307Z

hey, thanks for putting this out there and also for iterating on it! I will start using sending this to folks as a reference now that I know it's being maintained!

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