IANA Time Zone Database

The IANA Time Zone Database (also known as tz database or zoneinfo database) is a comprehensive, public-domain collection of time zone information maintained by the Internet Assigned Numbers Authority (IANA). It provides historical and current data on time zones worldwide, including rules for daylight saving time, offsets from UTC, and geographical identifiers. This database is the authoritative source for time zone handling in most software systems, including operating systems, programming languages, and applications.

Also known as: tz database, zoneinfo database, Olson database, IANA tz, timezone database

Why learn IANA Time Zone Database?

Developers should learn and use the IANA Time Zone Database when building applications that require accurate time zone conversions, scheduling across regions, or handling historical dates with correct local times. It is essential for global software, financial systems, travel applications, and any service where time accuracy across different locations matters. Using this database ensures compliance with real-world time zone rules and avoids errors from hardcoded or outdated time zone data.

Learning Resources

• docs: IANA Time Zone Database Official Page
• docs: tz database Wikipedia Entry
• tutorial: Working with Time Zones in Programming (MDN Web Docs)
• video: Time Zone Best Practices for Software Developers
• tutorial: Programming with Time Zones in Python (Real Python Tutorial)