We are getting a ton of hydration mismatches. Moving DateTime calcs to react useEffects #1936
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…ide. Moving Date calculations to useState/useEffect
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Pull Request Overview
This PR addresses hydration mismatch issues causing excessive Azure costs by moving client-side date calculations into React useEffect hooks. The changes prevent server-client rendering discrepancies for time-based content.
- Wraps date formatting logic in useEffect hooks to execute only on client-side
- Adds suppressHydrationWarning attributes to components displaying relative time
- Moves year calculation to build-time to avoid runtime hydration mismatches
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| src/templates/rule.js | Conditionally renders relative time only on client-side with hydration warning suppression |
| src/components/latest-rules-content/latestRulesContent.js | Converts FormatDate to stateful component with useEffect for client-side time calculations |
| src/components/footer/footer.js | Moves deploy time calculation to useEffect and year calculation to build-time |
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jakebayliss
had a problem deploying
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bradystroud
approved these changes
Sep 30, 2025
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We are getting hammered by hydration mismatch browser exceptions - about 2 million in the last 30 days causing spikes in Azure spend. After investigation this is likely due to not setting our dates inside react useEffects.