Unix Timestamp Converter — Epoch, ISO & Time Zones

Introduction

Unix time counts seconds (or milliseconds) since 1970-01-01 00:00:00 UTC. This converter auto-detects 10-digit seconds vs 13-digit milliseconds, 17–20 digit Discord snowflakes, formats the instant in UTC and a chosen IANA zone, and can batch-convert one value per line. Hex seconds, ISO week, weekday, and Excel serial are included. Nothing is sent to a server.

Step-by-step

1. Paste a Unix timestamp, ISO-8601 string, or Discord snowflake — or pick a date
2. Choose an IANA time zone and optional 12-hour display
3. Copy seconds, milliseconds, ISO, RFC 2822, or all formats at once

Worked example

1577836800 seconds is 2020-01-01 00:00:00 UTC. In Asia/Kolkata that instant is 05:30 the same morning. Hex seconds are 0x5e0be100.

Use cases

• Decode log timestamps from APIs and databases
• Build ISO-8601 strings for a specific time zone
• Convert a spreadsheet column of epoch values in one paste
• Turn a Discord message id into a UTC time

Frequently asked questions