This amendment specifies the PER encodings for the TIME type, for the useful time types (DATE, TIME-OF-DAY, DATE‑TIME, and DURATION) and for the defined time types specified in the ASN.1 module DefinedTimeTypes of ITU‑T Rec. X.680/Amd.3 | ISO/IEC 8824-1/Amd.3, Annex A bis.
Property settings for the abstract values of the useful and defined types are specified in ITU-T Rec. X.680/Amd.3 | ISO/IEC 8824-1/Amd.3, Annex A bis. Property settings for the additional time types are defined by an application designer using the property setting subtype notation (which is PER visible). These property settings are used to determine optimal PER encodings. In particular, a DATE will normally encode into 15 bits, a TIME-OF-DAY into 17 bits, a DATE-TIME into 32 bits (four octets) and a DURATION will frequently encode into 16 bits or less (two octets).