Epoch Milliseconds vs Seconds — Which Format?
Quick Answer: Unix epoch seconds have 10 digits (e.g., 1704067200); milliseconds have 13 digits (e.g., 1704067200000). JavaScript and Java use milliseconds; Python, Go, and most Unix tools use seconds. Paste any timestamp and the tool auto-detects the format.
Current Unix Epoch
1776009213
2026-04-12T15:53:33.000Z
FAQ
How do I tell if a timestamp is seconds or milliseconds?
Count the digits. 10 digits = seconds (current range: 1.7 billion). 13 digits = milliseconds. Microseconds have 16 digits, nanoseconds have 19.
Which languages use milliseconds?
JavaScript (Date.now()), Java (System.currentTimeMillis()), and C# (DateTimeOffset.ToUnixTimeMilliseconds()). Python, Ruby, Go, and PHP use seconds by default.