Unix Timestamp Converter

This converter moves between Unix epoch values and calendar dates in both directions. Paste a timestamp and pick whether it is in seconds or milliseconds, or leave the detection on automatic, and it returns the UTC date, the same moment in a time zone you choose, the ISO 8601 string, the day of the week and the ISO week number. Going the other way, type a date as YYYY-MM-DD with an optional time, say which zone that clock reading belongs to, and it gives you the epoch value in seconds and in milliseconds. Automatic detection treats any value of eleven digits or more as milliseconds, so set the unit by hand for very distant dates. Local times come from the standard time zone database, so daylight saving is applied for the date you enter rather than for today.