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LangGraph Checkpoint Loses ZoneInfo and fold: Reproducing a One-Hour DST Shift

This story is from 2026-09-07. It is preserved in the archive; the latest stories are on the live feed.

A checkpoint can restore a Python datetime that still compares equal to the original and yet behave differently the next time your workflow crosses a DST boundary. I reproduced that failure shape against LangGraph upstream commit 81bf17b23 with langgraph-checkpoint 4.2.0 metadata. The surprising pa…

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  1. 2026-09-07 05:24 · DEV Community — AI
    LangGraph Checkpoint Loses ZoneInfo and fold: Reproducing a One-Hour DST Shift

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