// seconds or milliseconds?
A classic Unix timestamp counts seconds since 1970-01-01 00:00:00 UTC (the "epoch"). For dates around now that's a 10-digit number. JavaScript, Java, and many APIs use milliseconds instead, a 13-digit number.
This converter auto-detects: more than 10 digits is treated as milliseconds, otherwise as seconds. The "date → timestamp" box reads your input in your local timezone (datetime-local), then reports both UTC and epoch.
Privacy: all date math runs in your browser using the native
Date object. Nothing is sent anywhere.
Related: scheduling a recurring job? The Cron Expression Builder translates cron syntax to plain English.
// a free, browser-only tool by Tiempo Software, built in Omaha, Nebraska. Runs entirely in your browser; nothing you enter is uploaded. see all tools.