Verified Developer Solution • 100% OfflineFix "Invalid Date" in JavaScript Date Parsing
Understand why new Date() returns Invalid Date and how to correctly parse timestamps.
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`).
JavaScript requires epoch timestamps to be in milliseconds. Multiply seconds by 1000 before passing them to the Date constructor. For strings, stick to ISO format `YYYY-MM-DDTHH:mm:ss.sssZ`.
Code Standard: Bad Pattern vs Verified Fix
Live Syntax1// ❌ Bad: Passing seconds2const date = new Date(1672531200); // Year 19703 4// ✅ Good: Passing milliseconds5const date = new Date(1672531200 * 1000); // Year 2023Test and resolve this using Epoch / Timestamp Converter
Execute directly in your browser memory. Zero API keys, zero network tracking, completely client-side.
Frequently Asked Questions
Q:Why does Safari return Invalid Date but Chrome works?
Safari strictly requires ISO formats (like using "T" and "Z") whereas Chrome aggressively tries to parse irregular formats like "2023-01-01 12:00:00".
Q:How can I convert epochs manually?
Use our Epoch Converter to safely translate seconds and milliseconds to human time.