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6/28/2026
I Built a Browser-Only Timestamp Converter — Epoch ↔ Date, 30+ Timezones, DST-Aware, 124 Tests

I Built a Browser-Only Timestamp Converter — Epoch ↔ Date, 30+ Timezones, DST-Aware, 124 Tests

Short summary

A developer built a browser-based timestamp converter supporting 30+ IANA timezones with automatic DST detection. The tool converts between Unix timestamps (seconds/milliseconds), ISO 8601, RFC 2822, and readable dates entirely in the browser with zero dependencies. The implementation uses JavaScript's Intl.DateTimeFormat API to handle timezone math correctly, backed by 124 tests covering DST transitions, half-hour offsets, and negative timestamps.

  • •Browser-based timestamp converter with 30+ timezones and DST awareness
  • •Converts Unix timestamps ↔ ISO 8601/RFC 2822/readable formats
  • •Zero dependencies, 124 tests, open-source vanilla JavaScript implementation

Generated with AI, which can make mistakes.

#product-launch#open-source
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