| Attributes | In addition to global attributes| period | supplies a pointer to some location defining a named
period of time within which the datable item is understood to
have occurred. | | when | supplies the value of a date or time in a standard form,
e.g. yyyy-mm-dd.| Status | Optional | | Datatype | | | Values | A normalized form of temporal expression conforming to the W3C
XML Schema Part 2: Datatypes Second Edition. | Examples of W3C date, time, and date & time formats. <date when="1945-10-24">24 Oct 45</date>
<date when="1996-09-24T07:25:00Z">September 24th, 1996 at 3:25 in the morning</date>
<time when="1999-01-04T20:42:00-05:00">Jan 4 1999 at 8 pm</time>
<time when="14:12:38">fourteen twelve and 38 seconds</time>
<date when="1962-10">October of 1962</date>
<date when="--06-12">June 12th</date>
<date when="---01">the first of the month</date>
<date when="--08">August</date>
<date when="2006">MMVI</date>
<date when="0056">56 AD</date>
<date when="-0056">56 BC</date> | This list begins in
the year 1632, more precisely on Trinity Sunday, i.e. the Sunday after
Pentecost, in that year the <date calendar="Julian" when="1632-06-06">27th of May (old style)</date>. | <opener>
<dateline>
<placeName>Dorchester, Village,</placeName>
<date when="1828-03-02">March 2d. 1828.</date>
</dateline>
<salute>To
Mrs. Cornell,</salute> Sunday <time when="12:00:00">noon.</time>
</opener> | | Note | The value of the when attribute is a string
representing a date or time, or both, in any
one of the following forms:
- a date in any of the standard formats described by
XML Schema Part 2: Datatypes Second Edition,
i.e. most commonly yyyy-mm-dd, but also
yyyy, --mm, ---dd,
yyyy-mm, or --mm-dd
- a time in the standard format described by
XML Schema Part 2: Datatypes Second
Edition, i.e. hh:mm:ss
- a combined date and time in any of the standard
formats described by XML Schema Part 2: Datatypes
Second Edition, i.e.
yyyy-mm-ddThh:mm:ss
The value of when is constrained to be in one of
the date, time, or combined date & time formats recognized
by the W3C XML Schema Part 2: Datatypes
specification. This is true whether the date component (if
any) is a Gregorian or a proleptic Gregorian date. At the time of this writing, the W3C does not permit the
year 0000, which would normally be used to
represent the year 1 BCE. Using the current W3C system, the
year 1 BCE is indicated with -0001, the year 2 BCE
with -0002, etc. It is the intention of the
XML Schema Working Group to allow 0000 as …
the lexical representation of 1 BCE (which is a leap year),
-0001 will become the lexical representation of 2
BCE, -0002 of 3 BCE, etc. Thus in some
cases it may be advantageous to use the when-iso
attribute to indicate years BCE instead. |
| | notBefore | specifies the earliest possible date for the event in
standard form, e.g. yyyy-mm-dd.| Status | Optional | | Datatype | | | Values | A normalized form of temporal expression conforming to
the W3C XML Schema Part 2: Datatypes Second
Edition. |
| | notAfter | specifies the latest possible date for the event in
standard form, e.g. yyyy-mm-dd.| Status | Optional | | Datatype | | | Values | A normalized form of temporal expression conforming to the W3C
XML Schema Part 2: Datatypes Second Edition. |
| | from | indicates the starting point of the period in standard form, e.g. yyyy-mm-dd.| Status | Optional | | Datatype | | | Values | A normalized form of temporal expression conforming to
the W3C XML Schema Part 2: Datatypes Second
Edition. |
| | to | indicates the ending point of the period in standard
form, e.g. yyyy-mm-dd.| Status | Optional | | Datatype | | | Values | A normalized form of temporal expression conforming to
the W3C XML Schema Part 2: Datatypes Second
Edition. |
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