Developer Builds Free 100-City Timezone Tool to Simplify Cross-Zone Scheduling

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A developer specializing in data pipelines and cross-timezone scheduling has built a free tool covering 100 city timezone pages to help engineers quickly reference time differences and automatically calculate Daylight Saving Time. The project grew out of firsthand experience with common timestamp pitfalls, including seconds-vs-milliseconds mismatches, incorrect UTC storage, and DST-related scheduling errors. The toolkit already includes 16 timestamp utilities and 30 language-specific pages covering Python, JavaScript, Java, SQL, and more, each highlighting real-world bugs. An open-source MCP integration is also available on GitHub, allowing timestamp conversion and validation to be piped directly into LLM workflows. All tools are free and openly accessible, aimed at developers who have encountered similar time-handling challenges.

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