Time and timezone converters

Time conversion is the kind of thing you only need until you need it badly: scheduling a call across three time zones, parsing a Unix timestamp from a server log, translating 12-hour time for someone whose system uses 24-hour. The tools here cover those translations with no log-in and no surprises around daylight-saving boundaries.

The Unix timestamp converter goes both directions: paste a timestamp (seconds or milliseconds, auto-detected) and get the human-readable date in your timezone and UTC; type a date and get the timestamp. Useful for log analysis, debugging API responses, and cross-system date matching where one side stores Unix time. The timezone converter picks two cities (or any IANA timezone identifier) and shows the offset live — handles DST automatically based on the date you pick, so the result for "9 AM New York to London" varies by month.

The 12-hour ↔ 24-hour clock tool covers the most error-prone time translation: AM/PM to 24-hour and back, with explicit handling of midnight (00:00 vs 12:00 AM) and noon (12:00 vs 12:00 PM) where conventions disagree. Timezone math uses the JavaScript Intl API, so the results are consistent with the same APIs your applications already use server-side.