Universal Decimal Classification UDC Consortium 2019-03-06 2019-03-06 14:18:16 en Common auxiliaries of time. Table 1g... The common auxiliaries of time denote the date, point of time or range of time of a subject represented by a main UDC number. The basis of date indication is the Christian calendar, but non-Christian systems of time reckoning are also allowed for (in "68" and "69"), as well as other time concepts, e.g. seasons and geologic time Auxiliares comunes de tiempo. Tabla 1g Auxiliares comuns de tempo. Tabela 1g 2019-03-06 15:43:10