A curated list of resources about time: definitions, standards, time zones, calendars, atomic clocks, synchronization protocols, software, hardware, and more.
- IANA Time Zones Database (tzdata) - The
canonical source of timezone rules used by nearly every OS and language.
- Sources and Links - community-contributed content contained in the time zone database.
- RFC 5905 - Network Time Protocol Version 4: Protocol and Algorithms Specification
- RFC 8915 - Network Time Security for the Network Time Protocol
- RFC 9109 - Network Time Protocol Version 4: Port Randomization
- RFC 9769 - NTP Interleaved Modes
- Network Time Protocol Version 5 (draft)