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Juri Pakaste Jul 10, 2023

I ran into DateFormatter/ISO8601DateFormatter speed issues again, and wrote a faster timestamp parser in Swift: https://github.com/juri/Parse3339

GitHub - juri/Parse3339: A fast pure Swift RFC 3339 timestamp parser

A fast pure Swift RFC 3339 timestamp parser. Contribute to juri/Parse3339 development by creating an account on GitHub.

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Jukka Partanen Jul 10, 2023

@juri What are the issues exactly? We’re using DateFormatter quite a lot.

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Juri Pakaste

@jtp42 Check the benchmarks in the README I have in the repo. With the current hardware it's not the worst thing in the world, especially if you do the parsing in a background queue and maybe use caching if you're likely to see duplicates, but still, I see stringFromDate in Instruments traces often enough that it felt worth it.