Unix Timestamp Converter
Convert Unix epoch timestamps (seconds or milliseconds) to ISO 8601, UTC, and local IST dates—or convert dates back to epoch numbers.
How the Unix Timestamp Converter works
Convert Unix epoch timestamps (seconds or milliseconds) to ISO 8601, UTC, and local IST dates—or convert dates back to epoch numbers. Below is the exact mathematical or algorithmic model used by this date & time utility, along with its key operating assumptions.
Unix Seconds = floor(Date.getTime() ÷ 1000). Milliseconds = Date.getTime() since 1970-01-01T00:00:00Z.Step-by-step workflow
- Paste or type your input string, payload, or expression into the Unix Timestamp Converter editor.
- Your browser executes Unix Seconds = floor(Date.getTime() ÷ 1000). Milliseconds = Date.getTime() since 1970-01-01T00:00:00Z. locally using native Web APIs without transmitting data over the network.
- Inspect validation diagnostics, byte/character metrics, or formatted output and copy the result in one click.
Worked example & key advantages
Convert a JWT exp claim like 1793032800 into its exact UTC and IST human-readable timestamp.
Why use this Unix Timestamp tool
- Zero-telemetry local execution—safe for formatting production JSON payloads, tokens, regexes, and hashes.
- Uses standards-compliant browser APIs (RFC 8259 JSON, RFC 4648 Base64, RFC 4122 UUID, SubtleCrypto SHA-2, IANA tzdb).
- Instant feedback with byte-size metrics, line-number syntax diagnostics, and one-click clipboard copy.
Important Assumptions & Scope
- 10-digit numbers represent seconds since the Unix epoch; 13-digit numbers represent milliseconds.
Frequently Asked Questions — Unix Timestamp
Clear answers to common questions about methodology, edge cases, and privacy.
What is the Unix Epoch?
The Unix Epoch is 00:00:00 UTC on 1 January 1970. Unix timestamps count the elapsed seconds or milliseconds since that moment.
Is it safe to use the Unix Timestamp Converter with confidential production data?
Yes. The Unix Timestamp Converter executes entirely within your browser tab's memory using native JavaScript and Web Crypto APIs—no payloads, tokens, or strings ever leave your device.
Does the Unix Timestamp support UTF-8 and multi-line inputs?
Yes. All UtilAxis developer utilities handle multi-byte UTF-8 characters (including ₹, accented characters, and emojis) as well as multi-line payloads without truncation.