Converters — formats and units

A converter is the simplest possible tool: take a value, give it back in a different shape. The hard part is getting the edge cases right — leap years, milliseconds versus seconds, timezone offsets, malformed input, fractional values. A good converter handles all of them quietly so you do not have to think about them.

This category is seeded with a Unix timestamp converter that handles both directions with autodetected units and live updates as you type. It accepts seconds or milliseconds, shows the result as an ISO 8601 string, a human-readable UTC date, and a local-time rendering simultaneously, so you can copy whichever one your downstream system expects. More converters (number-base, units, time zones) are on the way — each will follow the same pattern: instant, bidirectional, with documented gotchas.

Every converter runs entirely in your browser. The timestamps you convert, the dates you parse, and the values you copy never touch a server — useful when you are debugging a production incident with real customer data, or just checking when a token expires.