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Unix Timestamp Converter — epoch ↔ date

Convert Unix timestamp (epoch) to date and back. Auto-detects seconds/milliseconds, shows local + UTC + ISO 8601 + relative time.

All tools Browser-only

From Unix Timestamp

Timestamp

Auto-detect Seconds (10 digits) Milliseconds (13 digits)

From Date/Time

Date & time

Unix Timestamp = seconds since 1970-01-01 UTC. JavaScript Date uses milliseconds (×1000). Tool auto-detects 10 digits = seconds, 13 digits = ms.

What is Unix Timestamp?

Unix Timestamp (or Unix epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970 — known as "the epoch". It's the most consistent way computers store time across timezones.

Linux / macOS / Unix: date +%s returns the timestamp in seconds.
JavaScript: Date.now() returns milliseconds (×1000).
Python: time.time() returns seconds as a float.
Database: PostgreSQL/MySQL TIMESTAMP/DATETIME columns store epoch internally.

Seconds vs milliseconds

10 digits = seconds. E.g. 1730000000 (late 2024).
13 digits = milliseconds. E.g. 1730000000000.
16 digits = microseconds (rare).

The tool auto-detects based on digit count. You can also force seconds/ms via the radio buttons.

When to use it

Debug an API: response says "created_at": 1730000000 — convert to a real date.
JWT tokens: exp and iat claims are epoch — check if a token is still valid.
Database logs: server timestamps — quick conversion to your local time.
Cron schedules: figure out exactly when a cron job will run next.

Who this is for

Fullstack/backend/devops engineers — debug JWT, format JSON/SQL, parse cURL, compute CIDR subnets, draft Mermaid diagrams, write conventional commits… Daily toolkit alongside your terminal and editor.

FAQ

Is my pasted code/token sent anywhere?

No. All TopDev dev tools run 100% client-side — JWT, SQL, JSON, cURL, regex… process in-browser. Disconnect to verify. Safe for internal tokens, production DB queries, API keys.

Does it work offline / install as a PWA?

Tools work offline after the first load. Installable PWA is on the roadmap — for now you can bookmark and use without internet.