The descriptor dateAvailableEnd refers to the date that a version or rendition of a media item is officially
unavailable for publication, broadcast or distribution. A specific time may also be associated with the date.
To avoid problems in indicating date ranges for a media item's availability, PBCore has spawned two separate descriptors to capture specific dates that are independently searchable::
PBCore recommends that you employ the syntax ISO 8601 suggests for entering dates (e.g., YYYY-MM-DD), but by no means is the entire Date+Time string required as you enter a date or time stamp for your media item. The date and/or time designated is essentially an open-ended text string with highly recommended syntax for entering years, months, and days.
The recommended format consists of a text string for the representation of dates YYYY-MM-DD
- Year (YYYY) is defined as 0000 to 9999.
- Month (MM) is defined as 01 to 12.
- Day (DD) is defined as 01 to 28, 29, 30 or
31 as applicable.
- The separator between date fields is a hyphen,
If the full date is unknown, month and year (YYYY-MM)
or just year (YYYY) may
be used. Many other syntaxes are possible,
but if used, they may not be easily interpreted, searchable, or shareable.
If a date is approximate, add a question mark
but separate the date from the question mark by a space so that
mark is not interpreted
as part of the date value by a search
engine, e.g., 1922 ? .
Generally, a year or year-month-day designation will provide enough precision.
If needed, a specific time stamp may directly
follow the date designation. The time stamp can be enclosed within parentheses. The time format (hh:mm:ss) consists of two digit
designations for hours, minutes and seconds (19:20:30) in a 24
hour clock mode. If necessary,
the seconds may be further defined by a
decimal fraction of a second (19:20:30.45).
ISO 8601 requests the inclusion of a time zone designator (TZD) to complete a date/time statement, but PBCore does not require or mandate that specification.
To avoid problems in indicating date ranges, PBCore
has spawned two separate qualified dates to mark the availability
of a resource: