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Unix Timestamp Converter

Timestamp ⇄ local date · seconds / milliseconds

Unit
Current time
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Timestamp → Date
Date → Timestamp

Overview: Unix Timestamp Converter is a professional two-way converter between Unix timestamps and human-readable dates. A Unix timestamp is the number of seconds (or milliseconds) since 1970-01-01 UTC, and it is the most common time representation in programming languages and databases. The tool supports both seconds and milliseconds, and shows local time, UTC time, ISO 8601 and a relative-time description side by side.

How to use: Step 1 — the top "Current time" panel keeps refreshing to show the current Unix timestamp; you can copy the second, millisecond or ISO forms in one click. Step 2 — to convert a timestamp to a date, enter a number in the "Timestamp → Date" panel below (pick seconds or milliseconds in the top-right first) or click the "Now" button to fill in the current time. Step 3 — to convert a date to a timestamp, use the native date-time picker in the "Date → Timestamp" panel. Step 4 — the result includes local time, UTC time, ISO 8601 and a relative description (such as "3 days ago"). Press "Copy" next to any value.

Typical scenarios: Restore Unix timestamps embedded in back-end logs to readable dates; convert timestamp columns such as created_at when producing analytics reports; verify exp and iat claims inside a JWT; integrate with third-party APIs that use timestamps in signed parameters (WeChat, Alipay); handle time-format conversion in ETL pipelines; construct test cases that need a specific date.

Technical notes: Second-level timestamps have 10 digits (for example 1730000000) and millisecond-level ones have 13 (1730000000000). JavaScript’s Date uses milliseconds internally. ISO 8601 output is in UTC (with a trailing Z). Local time uses the browser’s time zone. Relative time is based on the device clock, so an inaccurate clock will introduce drift. The tool supports the range 1970–2286 (64-bit ms values sidestep the 32-bit second overflow).

Privacy: All conversion happens locally in your browser and no timestamp data is uploaded, so it is safe to use with time fields from any business system.

Frequently Asked Questions

How do I use Unix Timestamp Converter?
Step 2 — to convert a timestamp to a date, enter a number in the "Timestamp → Date" panel below (pick seconds or milliseconds in the top-right first) or click the "Now" button to fill in the current time. Step 3 — to convert a date to a timestamp, use the native date-time picker in the "Date → Timestamp" panel.
What can Unix Timestamp Converter do?
Typical scenarios: Restore Unix timestamps embedded in back-end logs to readable dates; convert timestamp columns such as created_at when producing analytics reports; verify exp and iat claims inside a JWT; integrate with third-party APIs…
Is my data private when I use Unix Timestamp Converter?
Privacy: All conversion happens locally in your browser and no timestamp data is uploaded, so it is safe to use with time fields from any business system. Privacy: All conversion happens locally in your browser and no timestamp data is uploaded, so it is safe to use with time fields from any business system.
What technical details should I know about Unix Timestamp Converter?
ISO 8601 output is in UTC (with a trailing Z ). Relative time is based on the device clock, so an inaccurate clock will introduce drift.