Unix Timestamp Converter Online — Time Conversion Tool
Free online Unix timestamp converter. Convert timestamps to ISO 8601, UTC, local time and back. Supports milliseconds and seconds.
Unix timestamp converter transforms time marks into readable date formats and back. Supports ISO 8601, UTC, local time with timezone. Shows current timestamp with auto-update every second.
Quick Presets
Relative
Time Boundaries
Supported: seconds (10), milliseconds (13), microseconds (16), nanoseconds (19+ digits)
What is Unix Timestamp?
Unix timestamp is the number of seconds or milliseconds that have elapsed since January 1, 1970 00:00:00 UTC (Unix Epoch). It's a universal way of representing time in computer systems.
Timestamps are used everywhere: in databases, logs, APIs, file systems. They are timezone-independent and easily compared mathematically.
Where is timestamp used?
- Databases — storing creation, update, deletion times of records
- APIs and web services — transferring temporal data between client and server
- Logging — event timestamps in system and application logs
- Caching — determining cache lifetime and data validation
Timestamp formats
There are two main Unix timestamp formats:
- Seconds (10 digits) — classic format, e.g.: 1703001600
- Milliseconds (13 digits) — used in JavaScript, e.g.: 1703001600000
- ISO 8601 — international standard, e.g.: 2023-12-19T12:00:00.000Z
- UTC — human-readable UTC format, e.g.: Tue, 19 Dec 2023 12:00:00 GMT
How does the converter work?
The converter transforms timestamps into various date formats and vice versa:
- Timestamp → Date: converts numeric value into Date object
- Date → Timestamp: calculates milliseconds since Unix Epoch
- Automatically detects format (seconds or milliseconds) by digit count
- Shows result in various formats: ISO, UTC, local time, relative time