What is a Unix epoch timestamp?

A Unix epoch timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 00:00:00 UTC. It is widely used in programming for date/time storage and transmission.

How do I know if my timestamp is in seconds or milliseconds?

A 10-digit number is in seconds (e.g., 1700000000), while a 13-digit number is in milliseconds (e.g., 1700000000000). DevDash auto-detects this for you.

Can I convert a human date back to epoch?

Yes. Simply type or paste a date string and DevDash will output the corresponding Unix timestamp in both seconds and milliseconds.

Epoch Converter

Time Tools

Convert Unix timestamps to human-readable dates and vice versa

By DevToolHQ teamUpdated 2026-04-15100% client-sideMethodology

100% client-side processing

Current Unix Epoch

1776833662

2026-04-22T04:54:22.000Z

Epoch to Date

Date to Epoch

About Epoch Converter

Unix epoch timestamps are the standard way applications store and transmit dates and times. Instead of formatting dates as strings (which vary by locale and timezone), systems store a single integer — the number of seconds since January 1, 1970 00:00:00 UTC. This tool converts between epoch timestamps and human-readable dates in both directions. Paste a 10-digit number (seconds) or 13-digit number (milliseconds) and get the equivalent date in ISO 8601, UTC, and your local timezone. Or enter a date string and get the epoch value back. The auto-detection between seconds and milliseconds is intentional — the two formats are constantly confused. JavaScript's Date.now() returns milliseconds; most Unix/Linux tools expect seconds; databases vary. The tool also shows a live-ticking current epoch, which is handy when you need to quickly check what "now" is in timestamp form. Common use cases: debugging API responses that contain timestamp fields, checking whether a JWT is expired, working with Cloudflare Cache-Control headers, setting cron-based data retention policies, and converting log timestamps from different services that use different formats. The conversion is pure client-side math — no server round-trip needed.