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What is ISO 8601 format?

Written with help from Gemini 2.5 Flash.

ISO 8601 is a widely used international standard for representing dates and times. It provides a consistent and unambiguous way to express dates and times, regardless of cultural differences or time zones.

Key components of ISO 8601 used in the Orca Sightings service

  • YYYY-MM-DD: Represents the date with four digits for the year, two for the month, and two for the day.
  • hh:mm: Represents the time of day with two digits for the hour, and two for the minute. Uses a 24-hour clock.
  • T: Separates the date and time components.

Examples of ISO 8601 formats

  • YYYY-MM-DD: 2025-01-27 (January 27, 2025)
  • YYYY-MM-DDTHH:mm: 2025-05-18T14:30 (May 18, 2025, at 2:30 PM)

Benefits of using ISO 8601

  • Unambiguous: Eliminates the potential for confusion that can arise from different date formats in different cultures.
  • Standardized: Provides a universally accepted format for representing dates and times.
  • Time zone aware: Allows for precise representation of time, including UTC and offsets from UTC.
  • Computer-readable: Easy to parse and process by computers and applications.

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Copyright © 2025 Julie Brodeur (technical writer) and Jeff Naemura (subject matter expert). Distributed by an MIT license. This work is for educational and demonstration purposes only.