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AAT ICAS 2220 ✧ IDC methods of dial unit decimalization

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.

IDC methods of dial unit decimalization

this document describes AAT ICAS specifications for IDC methods of dial unit decimalization. methods of decimalization that are not coherent to the main unit are strongly discouraged.

developers and users should consider that expressions of metric time may be differently represented among various dials. however the first two places of the second decitriad (txxx ttXXx) are specified for use as subminor clock units for all IDC dials. for most practical purposes dial units are specified for decimalization with regard to the main unit. the decitriad identifier 't' always specifies decimalization with regard to the main unit. an alternative lowercase decimalization specifier may however be considered for use between the major, minor, or subminor clock-unit places:

the distinction between methods of decimalization is non-trivial for the dialXX, dialXL, and dialL dial units, and users should consider conformance with ICAS usage.

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
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