A well-known reference instant
1700000000 (seconds) converts to 2023-11-14T22:13:20.000Z — the same instant also written as 1700000000000 in milliseconds.
ISO 8601 timestamp converter (Unix too)
Convert between a Unix timestamp (seconds or milliseconds, auto-detected) and an ISO 8601 / RFC 3339 date-time in UTC — the exact same timestamp format SkedCast’s own /v1 API sends and accepts on every response and request body. Enter either form and see the other computed instantly, useful for reading a log line, a database value, or debugging an API request.
Convert your ISO 8601 timestamp
Seconds or milliseconds — auto-detected by length.
The same format SkedCast's own /v1 API uses for every timestamp.
Unix seconds
1700000000
Unix milliseconds
1700000000000
ISO 8601 (UTC)
2023-11-14T22:13:20.000Z
How to use the timestamp converter
- Enter a Unix timestamp. Type a number of seconds or milliseconds; the unit is auto-detected by length.
- Or enter an ISO date-time. Type an ISO 8601 / RFC 3339 string instead, if that’s what you have.
- Read the converted forms. See the Unix seconds, Unix milliseconds and ISO 8601 (UTC) forms together.
- Use whichever form you need. Copy the specific format your code, log or API call expects.
Worked examples
Auto-detecting the Unix unit
A 10-digit number like 1700000000 is read as seconds; a 13-digit number like 1700000000000 is read as milliseconds — the tool picks the right unit by magnitude automatically.
ISO 8601 timestamp converter FAQ
- How does it know if my number is seconds or milliseconds?
- By magnitude — a value under roughly 100 billion is treated as seconds, and anything larger is treated as milliseconds.
- What timestamp format does SkedCast’s own API use?
- ISO 8601 / RFC 3339 in UTC, on every request and response — the exact same format this converter’s ISO output uses.
- What is the Unix epoch?
- January 1, 1970, 00:00:00 UTC — timestamp 0 in this converter, the reference point every Unix timestamp counts forward from.
- Does it handle dates before 1970?
- Yes — a negative Unix timestamp represents a date before the epoch, and the converter handles it the same way as a positive one.
- Does it store or send my input anywhere?
- No — every conversion happens entirely in your browser using the platform’s own real Date parsing, nothing sent to a server.
- Why does the ISO output always end in Z?
- Because the output is always in UTC, and "Z" is the standard ISO 8601 marker for UTC (zero offset from Coordinated Universal Time).
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