There are two perspectives on dates and times with Orbeon Forms:
the perspective of the user of the form, where those are human-readable
the perspective of the data storage, where those are stored in a standard, human-language-independent format
In this page we discuss dates and times from the perspective of the data.
When using XML, date and time formats usually follow the formats defined in XML Schema, which are a subset of ISO 8601 formats. Specifically, the formats for date, time, and dateTime are specified here: