Simon Willison’s Weblog

Tips on using python's datetime module. Wow. I’ve run in to problems with datetime and timezones before, but I had no idea how intrinsic those problems were to the design of the library.

Posted 6th July 2009 at 2:20 pm

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

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