Convert Unix (epoch) timestamps to human-readable dates and back. Auto-detects whether your value is in seconds or milliseconds. Includes a live current-timestamp display.
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How it works
A Unix timestamp is the number of seconds (or milliseconds) since 1970-01-01 00:00:00 UTC. To convert to a Date object, multiply seconds by 1000 (JavaScript uses milliseconds). We detect the unit automatically: values above 10^12 are treated as milliseconds.
Formula
Unix Time = (Date - 1970-01-01 UTC) / 1000
Key features
- Auto-detection of seconds vs milliseconds
- UTC and local time output
- ISO 8601 output
- Reverse conversion (date → timestamp)
- Live current-timestamp clock
- One-click copy
Common use cases
API debugging
Turn `1717171717` into a human-readable time to check whether a token has expired.
Database queries
Convert between SQL DATETIME and epoch.
Log correlation
Unix timestamps are the lingua franca of logging systems.
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Pro tips
- ◆10-digit number = seconds. 13-digit number = milliseconds. Our tool auto-detects.
- ◆JWT `exp` claims are always in seconds.
Common mistakes to avoid
- ✕Multiplying by 1000 when the timestamp is already in milliseconds — you'll get a date in the year 55000.
Frequently asked questions
What is the year 2038 problem?▼
A 32-bit signed integer overflows on 19 January 2038. Modern systems use 64-bit so this isn't a practical issue anymore, but legacy systems must be migrated.
Are Unix timestamps timezone-aware?▼
No — they always represent UTC. Timezone only matters when formatting for display.
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