---
title: "Discussion on \"LangGraph checkpoints turn ZoneInfo datetimes into fixed offsets (DST math off by an hour after resume)\" | Hashnode"
description: "Discussion on \"LangGraph checkpoints turn ZoneInfo datetimes into fixed offsets (DST math off by an hour after resume)\". A zone-aware datetime in graph state comes back from the checkpointer with a fixed UTC offset. How to spot it and store times safely."
url: "https://hashnode.com/posts/langgraph-checkpoint-datetime-zoneinfo-lost-dst-off-by-one-hour/6af1f3a85f866094768ebd67"
---

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# [LangGraph checkpoints turn ZoneInfo datetimes into fixed offsets (DST math off by an hour after resume)](https://memorysync.hashnode.dev/langgraph-checkpoint-datetime-zoneinfo-lost-dst-off-by-one-hour?utm_source=hashnode&utm_medium=feed)

A zone-aware datetime in graph state comes back from the checkpointer with a fixed UTC offset. How to spot it and store times safely.

2d ago · 7 min read · memorysync.hashnode.dev  
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Building MemorySync (memorysync.io) — persistent memory infrastructure for AI agents, Cursor, and Claude Code.

Building MemorySync (memorysync.io) — persistent memory infrastructure for AI agents, Cursor, and Claude Code.

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