Epoch ↔ human date, in UTC and your local time.
A Unix timestamp counts seconds since 1 January 1970 UTC (the epoch). This converter accepts seconds or milliseconds (auto-detected) and shows the date in UTC, ISO 8601 and your local timezone. Click Use current time to grab the present epoch. All conversion happens in your browser.
Both — the tool auto-detects: 10-digit values are treated as seconds, 13-digit as milliseconds.
Both UTC and your device's local timezone, plus the ISO 8601 string.