Developers encounter Unix timestamps constantly in APIs, databases, and logs. Our free Unix Timestamp Converter shows the current epoch time live (seconds and milliseconds), converts timestamps to readable dates in UTC and your local timezone, and converts date-time inputs back to epoch values.
What Is a Unix Timestamp?
A Unix timestamp counts the seconds (or milliseconds) elapsed since January 1, 1970 00:00:00 UTC — known as the Unix epoch. Because it is a single integer, it is easy to sort, compare, and store without timezone ambiguity at the storage layer.
Why Developers Use Timestamps
APIs and databases store dates as timestamps for simpler sorting and comparison. A log entry at 1717881600 is unambiguous globally. When you display it to users, you convert to a locale-aware string — but the stored value stays timezone-neutral.
Seconds vs Milliseconds
JavaScript's Date.now() returns milliseconds (13 digits). Many server APIs return seconds (10 digits). To convert milliseconds to seconds, divide by 1000. Our tool auto-detects based on digit count so you do not have to guess.
UTC vs Local Timezone
The timestamp itself always refers to the same instant worldwide. When converting to human-readable form, UTC is the canonical reference — but users typically want local time. The converter shows both, with your browser timezone clearly labeled.
Related Reading
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp is the number of seconds (or milliseconds) elapsed since January 1, 1970 00:00:00 UTC — a universal, timezone-agnostic way to represent a specific moment in time.
Why do some timestamps have 10 digits and others 13?
A 10-digit timestamp counts seconds since the Unix epoch; a 13-digit timestamp counts milliseconds. JavaScript's Date.now() returns milliseconds while many server-side APIs use seconds.
Is a Unix timestamp always UTC?
The timestamp itself is timezone-agnostic — it refers to a specific moment globally. The timezone only matters when converting to a human-readable date for display.
What is the Unix epoch?
January 1, 1970 at 00:00:00 UTC — the reference point from which all Unix timestamps are counted.