- 30 Boxes
- Online calendar with an extensive list of features.
- A Walk through Time
- Presentation of the Physics Laboratory of the National Institutes of Standards and Technology on the evolution of time measurement.
- Atomic Clock Time
- Provides atomic clock information and resources.
- Calendar Zone
- Provides a comprehensive collection of calendars.
- Hermetic System: Calendar Studies
- Contains presentations on the different calendar systems, types, and date formats.
- International Standard Date and Time Notation
- Information on the standard notation that helps to avoid confusion in international communication caused by the many different national notations.
- Light of Day
- Discussion of the daylight saving time tackling affirmations and oppositions to it.
- Skeptic Calendar
- Offering a chronological history of calendars, and the tracking of time.
- W3C Date and Time Formats
- Defines a profile of ISO 8601, the International Standard for the representation of dates and times.
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