att.datable provides attributes for normalization of elements that contain dates, times, or datable events. [3.5.4 Dates and Times 13.3.6 Dates and Times]
Moduletei — The TEI Infrastructure
Membersacquisition affiliation age application binding birth bloc change climate country creation custEvent date death district education event faith floruit geogFeat geogName langKnowledge langKnown licence location name nationality occupation offset orgName origDate origPlace origin persName placeName population precision provenance region relation residence resp seal settlement sex socecStatus stamp state terrain time trait
Attributesatt.datable.w3c (@when, @notBefore, @notAfter, @from, @to) att.datable.iso (@when-iso, @notBefore-iso, @notAfter-iso, @from-iso, @to-iso) att.datable.custom (@when-custom, @notBefore-custom, @notAfter-custom, @from-custom, @to-custom, @datingPoint, @datingMethod)
calendarindicates the system or calendar to which the date represented by the content of this element belongs.
Status Optional
Datatype teidata.pointer

<sch:rule context="tei:*[@calendar]">
<sch:assert test="string-length(.) gt 0">@calendar indicates the system or calendar to which the date represented by the content of this element
belongs, but this <sch:name/> element has no textual content.</sch:assert>
He was born on <date calendar="#Gregorian">Feb. 22, 1732</date>
(<date calendar="#Julianwhen="1732-02-22"> Feb. 11, 1731/32, O.S.</date>).

Note that the calendar attribute (unlike datingMethod defined in att.datable.custom) defines the calendar system of the date in the original material defined by the parent element, not the calendar to which the date is normalized.

periodsupplies a pointer to some location defining a named period of time within which the datable item is understood to have occurred.
Status Optional
Datatype teidata.pointer

This ‘superclass’ provides attributes that can be used to provide normalized values of temporal information. By default, the attributes from the att.datable.w3c class are provided. If the module for names & dates is loaded, this class also provides attributes from the att.datable.iso and att.datable.custom classes. In general, the possible values of attributes restricted to the W3C datatypes form a subset of those values available via the ISO 8601 standard. However, the greater expressiveness of the ISO datatypes may not be needed, and there exists much greater software support for the W3C datatypes.