ISO 11104:2011建立了少量标准化推荐时间码格式，用于CCSDS机构之间的数据交换应用。ISO 11104:2011未解决稳定性、精度、准确性等计时性能问题。 时间码是时间信息的数字表示。ISO 11104:2011描述了四种标准推荐时间代码（一种“未分段”代码和三种“分段”代码），它们使用国际标准秒作为基本时间单位。未分段的时间码是从称为“历元”的起始时间开始的时间单位和小数时间单位的纯二进制计数。 分段时间码是一种时间单位和分数时间单位的计数累积在两个或多个级联计数器中的码，这些计数器从历元开始计算各种基的模。

ISO 11104:2011 establishes a small number of standardized recommended time code formats for use in data interchange applications between agencies of the CCSDS. ISO 11104:2011 does not address timing performance issues such as stability, precision, accuracy, etc. Time codes are digital representations of time information. ISO 11104:2011 describes four standard recommended time codes (one "unsegmented" and three "segmented" codes) which use the international standard second as the fundamental unit of time. An unsegmented time code is a pure binary count of time units and fractional time units from a starting time called the "epoch". A segmented time code is one in which the count of time units and fractional time units is accumulated in two or more cascaded counters which count modulo of various bases and start from the epoch.