---
title: "Discussion on \"A Day Isn't 24 Hours: Fixing Date Math & DST Bugs\" | Hashnode"
description: "Discussion on \"A Day Isn't 24 Hours: Fixing Date Math & DST Bugs\". A calendar day isn't always 24 hours. Learn why duration math breaks during Daylight Saving Time and how to write resilient calendar arithmetic in your code."
url: "https://hashnode.com/posts/why-a-day-is-not-24-hours/6af43d852eb9c13dc84f3b03"
---

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# [A Day Isn't 24 Hours: Fixing Date Math & DST Bugs](https://doogal.dev/why-a-day-is-not-24-hours?utm_source=hashnode&utm_medium=feed)

A calendar day isn't always 24 hours. Learn why duration math breaks during Daylight Saving Time and how to write resilient calendar arithmetic in your code.

8h ago · 5 min read · doogal.dev  
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