this post was submitted on 11 Jun 2025
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RFC 3339 if you please. Let's be prescriptive.
After all the self-important blowhards in the committe were satisified that they had put their fingerprint on the ISO8601 document with bullshit like "year-month-week" format support and signed off, they went home.
The rest stayed behind, waited a few minutes to be safe, and then quickly made RFC3339 like a proper standard.
This is what RFC3339 vs ISO8601 feels like.
Let's not forget that technically you have to pay for ISO8601, despite it being nearly useless as a standard because it allows several incompatible formats to coexist.
Fucking wild.
While a fucking stupid concept, it's nice that this particular format has a monetary deterrent.
Only if you want to say you have the certification for it, you can use it if you want, that is fine
ISO8601 is YYYY-MM-DD nothing to do with weeks and isn;t the only difference of RFC3339 that you can use a space instead of a T in between the date and time? Also RFC3339 is only an internet standard while ISO is a generally international standard?
Anyone help enlighten me about whatever this and unix epoch are getting at? Are these really more specific/better than iso 8601 and why specifically?
Happily!
So, first epoch time. It's a pretty robust standard, covers many use cases, has few edge cases... but it's specifically for machine usage, since it's not human readable and it's not reversible into the past (pre-1970).
ISO 8601 (depending on the annum), by the text of the documentation, these are all valid dates:
Etc.
RFC 3339 (& RFC 9557, it's newest modification) is actually a subset of ISO 8601 and is far more prescriptive. For example you must have a timezone designator. You must have a separator between the date and time. You must use a dash between date elements and a colon between time elements. You can easily add standardized subseconds.
This means that RFC 3339 is much easier to parse and use by both machines and humans.
This page (reddit, I know...) has a great summary, and so in the interest of knowledge and attribution I'll link it: https://www.reddit.com/r/ISO8601/comments/p572xy/rfc_3339_versus_iso_8601/
This website allows you to more directly compare the two interactively. https://ijmacd.github.io/rfc3339-iso8601/
This is delicious, and I can't say thank you enough. I like this a lot. If anyone has any insight on more superior standards or subsets of these, please inform me. This made my day tho 😊
ISO is a wider standard than the RFC standards though which is only for the internet