Convert Unix timestamps (seconds or milliseconds) to local, UTC, ISO 8601, and relative times.
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You pass a string or timestamp into `new Date()` and it evaluates to `Invalid Date`. This frequently happens when passing Unix epochs in seconds instead of milliseconds, or parsing non-ISO 8601 strings (like `YYYY-DD-MM`).
Your parsed dates are showing up as the year 54,000 or you receive a "time out of range" exception in your language of choice. This happens when you pass nanoseconds or microseconds into a function expecting milliseconds.
