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ISO 8601 is an international standard for date and time representations issued by the International Organization for Standardization (ISO). Specifically, the standard is titled "Data elements and interchange formats — Information interchange — Representation of dates and times". The signature feature of ISO 8601 date and time representations is the ordering of date and time values from the most to the least significant or, in plain terms, from the largest (the year) to the smallest (the second).