Unix Timestamp Converter — What Epoch Time Is and How to Use It

Unix timestamps are the number of seconds since January 1, 1970. They look like gibberish but they solve real problems. Here's why developers love them.

You're looking at a database record and the "created_at" field says 1712345678. What date is that? It's a Unix timestamp — the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC (known as the Unix epoch).

Why do we use timestamps?

Storing dates as numbers solves several annoying problems. First, timezone confusion. "March 15, 2026 at 3 PM" — which timezone? With a Unix timestamp, there's no ambiguity. It's a single point in time, period. When you display it, you convert to the viewer's timezone.

Second, math. How many days between two dates? With timestamps, just subtract and divide by 86400 (seconds in a day). With date strings, you need to parse, account for daylight saving time, handle leap years, and hope the format is consistent.

Third, sorting. Timestamps are just numbers, so sorting by date is as simple as sorting numbers. No date parsing required.

Common timestamp formats

Unix (seconds) — 10 digits. 1712345678

Milliseconds — 13 digits. 1712345678000 (JavaScript's Date.now())

ISO 8601 — Human-readable but still unambiguous. 2024-04-05T15:21:18Z

The Year 2038 Problem

Here's a fun one: Unix timestamps are traditionally stored as 32-bit integers, which max out at 2,147,483,647 — that's January 19, 2038. After that, 32-bit systems will overflow and think it's 1901. This is the "Y2K38" problem. Most modern systems use 64-bit timestamps now, which won't overflow for another 292 billion years.

Convert timestamps

Toolozo's Timestamp Converter converts between Unix timestamps and human-readable dates. Paste a timestamp, see the date. Pick a date, get the timestamp. It also shows the current timestamp in real-time. Essential for anyone working with APIs, databases, or log files.