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AAT ICAS 2062 ✧ conformance level A

document note: this document is part of the Integrated Chronological Applications System (ICAS). Alliance for the Advancement of Technology (AAT) provides ICAS standards documents subject to terms of use described in document AAT ICAS 9010. please refer to other key AAT ICAS standards documents accessible via the AAT ICAS web site at for important information about ICAS.

this document describes conditions and guidelines for claiming conformance to ICAS conformance level A standards. questions or comments relating to ICAS conformance level A may be addressed to or via other designated methods for contacting AAT ICAS.


conditions for use of ICAS conformance logo A—ICAS in use level A

ICAS licensees are granted limited permission to use ICAS conformance logo A, or alternatively the "ICAS in use level A" alt text, in accordance with AAT ICAS 2027, to indicate a claim of conformance to ICAS conformance level A subject to the following conditions:

claims of conformance with ICAS level A are also subject to the conditions specified for the generic ICAS in use level of conformance. ICAS licensees claiming conformance with ICAS level A must agree to abide by the conditions of conformance with the generic ICAS in use logo specified in AAT ICAS 2061.

licensees claiming ICAS conformance level A must indicate adherence to all of the conditions of conformance by one of the following methods:


checkpoints for ICAS conformance level A

guideline 2062-01. representation of date and time information with proper formats that are user-centered for a general reader or user. a general reader or user can be presumed the possibility to be accustomed to one or more different conventions for the representation of dates and times, or may be presumed the possibility to possess a disability such as limited sight or limited hearing. a general reader may moreover be presumed to have no prior knowledge of how a content provider has organized and applied particular formatting conventions. this checkpoint concerns areas referenced in the Web Content Accessibility Guidelines (WCAG) standards at as part of the Web Accessibility Initiative (WAI) at W3C.

date and time information are common parameters for users in the course of initiating searches and responding to forms. to the extent that time or date information can serve as a unit or mechanism of navigation, (WCAG 2.0 guideline 2.4 to "provide ways to help users navigate, find content, and determine where they are") and (WCAG 1.0 guideline 13 to "provide clear navigation mechanisms"), accessibility guidelines concerned with navigability call for the development of clear and consistent representations of time and date information in document systems.

accessibility guidelines concerned with readability, (WCAG 2.0 guideline 3.1 "make text content readable and understandable") and (WCAG 1.0 guideline 14 to "ensure that documents are clear and simple so that they may be more easily understood"), call for the development of more practicable formats for the representation of dates and times. a rationale for the development and use of uniform scales of date and time can be formulated in terms of usability and web accessibility; however licensees should note that general guidelines corresponding to ICAS and usability and web accessibility are subject to further development and further specification. ICAS guidelines for checkpoint 2062.01 include the following:

proper date and time formats should be readily unambiguous with regard to the scale (IDC or SMH, Uniform Calendar and New Calendar or Gregorian calendar) and with regard to the interpretation of component units such as year, month, and day. proper formats are foremost clear with little or no formatting cues (such as yyyy-mm-dd). if a general user has ample cause to question which numerical units (for example, 03/05/03) on a web page are year or month or day then the format does not conform with ICAS level A. format components should possess an appropriate number of places for the proper representation of a component: hour, minutes, and seconds are properly represented to 2 places each, even if the first place is a leading zero (for example, 01). decitriads are properly represented to 3 places each, even if the first places are leading zeros (for example, t001). day-of-month is likewise properly represented to 2 places. please see AAT ICAS 2020 and AAT ICAS 2340 and other ICAS standards documents for additional guidelines on the use of proper formats.

guideline 2062-02. proper representation of time and date scales. this checkpoint concerns the normative usage of metrication terms and the normative use of scalar expressions. please see AAT ICAS 2020, 2023, 2076, 3105 and other ICAS standards for guidelines on the proper usage of metrication terms and scalar expressions.

guideline 2062-03. proper use of an approved ICAS localization for uses of ICAS uniform scales of time and date. this checkpoint pertains to the use of the New Calendar, Uniform Calendar, or Inter-Dial Clock systems; and includes the use of ICAS uniform yeargroup element sets. this checkpoint also pertains to the use of ICAS element sets and ICAS vocabulary for the representation of traditional scales of date and time.

however the representation of traditional scales of date and time independent of ICAS element sets and ICAS vocabulary is not subject to an approved ICAS localization. for this type of conformance claim, ICAS licensees should exercise considerable care not to misrepresent a claim of ICAS conformance level A.

guideline 2062-04. reference to an effective version of ICAS. this checkpoint concerns the methods by which licensee use of ICAS is referenced to an effective version of ICAS. please see AAT ICAS 1002 and AAT ICAS 9059 for guidelines. if an effective version is not explicitly referenced in the use of an ICAS conformance logo, then some methods for accessing this information must be provided in relation to the scope of use for a claim of conformance. hyperlinking an ICAS conformance level A logo to the designated AAT ICAS conformance area web page is one method for satisfying this checkpoint.

guideline 2062-05. usage of ICAS conformance logo A. this checkpoint concerns the methods by which licensees use or represent conformance logo A. Alt text should be coded as "ICAS in use level A". please refer to AAT ICAS 2027 for additional guidelines. licensees may also re-review conformance with each of the other conditions and guidelines for ICAS conformance level A.

top document updated:

system identifiersdatetime
Uniform CalendarUCUCN 12019 S19 Yellow
Inter-Dial ClockIDCzone(UT)t339 tt050
'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'.
day of yearD-o-YAD common year day139
Gregorian calendarGG2019 May 19 Sunday
seconds, minutes, hoursSMHUT08:08:14
style legend


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