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AAT ICAS 2330 ✧ IDC methods for scheduling and metering

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 AAT ICAS methods for scheduling and metering. please also refer to AAT ICAS 2043 for additional information about IDC conversion methods.

IDC methods for scheduling and metering

consider the designation of time durations in terms of practicable IDC units. rather than converting SMH-scale values to corresponding IDC-scale values, which may introduce numerically inconvenient values, consider the designation of time quantities proportional to other units such as parts of a day, a main unit of one day, a day group, a month, a year, or some other fiscal period.

for example, rather than designating an IDC-scale value in terms of a conversion from a SMH-scale value such as a work day of 8 hours, consider designating a work day in terms of a practicable proportion of 1/3 of a main unit of one day (or 2/3 of a daylight period at equinox). rather than designating a mid-day break in terms of 1/2, 1, or 2 hours; consider designating a break in terms of a proportion in regard to the day schedule and the mid-day break.

Universal Time (UTC) is official world time for purposes of civil timekeeping. other time zones are politically or locally established. established methods for local time scheduling with regard to changes in local or seasonal time include one or more of the following:

as methods for scheduling to IDC 'deka' or 'euclid' time zone systems emerge, AAT may elect to not specify any special seasonal time zones (such as daylight or winter time) for these systems. time zone changes are not the only method for accommodating local schedules for seasonal changes in day or night times. seasonal changes can also be practicably addressed by the appropriate use of seasonal schedules (as they already are for other reasons like holidays, business, education, and so forth.), and without the need to reset clocks for a different season. information infrastructures for the management of time schedule information have been revolutionized by new technologies and by new media. in any case, matters relating to the designation of user schedules shall remain reserved to ICAS users.

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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