Simon Willison’s Weblog

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24th April 2026

Tool Millisecond Converter — Convert milliseconds into multiple time units with this interactive tool that displays the duration in seconds, minutes, hours, days, weeks, and a human-readable format. The converter accepts numbers with commas or underscores for readability and provides both a compact breakdown (e.g., "3 minutes, 7 seconds, 238 milliseconds") and a clock-format representation. Results can be copied to the clipboard with a single click for easy sharing or documentation.

LLM reports prompt durations in milliseconds and I got fed up of having to think about how to convert those to seconds and minutes.

Posted 24th April 2026 at 4:23 am

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