scope:

This standard specifies the representation of dates in the Greogorian calendar and times and representations of periods of time. It includes a) calendar dates expressed in terms of year, month and day of month; b) ordinal dates expressed in terms of year and day of year; c) dates identified by means of year, week numbers and day numbers; d) time of the day based upon the 24-hour timekeeping system; e) differences between local time and Coordinated Universal Time (UTC); f) combination of date and time; g) periods of time, with or without either a start or end date or both. This standard is applicable whenever dates and times are included in information interchange. This standard does not cover dates and times where words are used in the representation. This standard does not assign any particular meaning or interpretation to any data element that uses representations in accordance with this Standard. Such meaning will be determined by the context of the application.