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Convert Unix timestamps and ISO dates into readable time formats.
Unix to Date
2026-05-21T21:40:29.000Z 5/21/2026, 9:40:29 PM
Date to Unix
Unix seconds: 1779399629 Unix milliseconds: 1779399629202
Frequently asked questions
- Why is my Unix timestamp showing a date in 1970?
- Unix time counts seconds since 1970-01-01 UTC, so a small value like 60 maps to one minute past the epoch. Check whether your value is in seconds or milliseconds - JavaScript's Date constructor expects milliseconds.
- What's the difference between Unix seconds and Unix milliseconds?
- Standard Unix timestamps count seconds and are 10 digits for current dates, while JavaScript and many JSON APIs use millisecond precision and produce 13-digit values. Multiply or divide by 1000 to switch between them.
- Does ISO 8601 require a timezone?
- No, a timezone-less ISO 8601 string is valid and represents local time without offset. Append Z for UTC or an offset like +02:00 whenever the value will be shared across systems to avoid ambiguity.