Get the release date (and possibly time) in form of a string, if available.
For normal GStreamer plugin releases this will usually just be a date in
the form of "YYYY-MM-DD", while pre-releases and builds from git may contain
a time component after the date as well, in which case the string will be
formatted like "YYYY-MM-DDTHH:MMZ" (e.g. "2012-04-30T09:30Z").
There may be plugins that do not have a valid release date set on them.
Get the release date (and possibly time) in form of a string, if available.
For normal GStreamer plugin releases this will usually just be a date in the form of "YYYY-MM-DD", while pre-releases and builds from git may contain a time component after the date as well, in which case the string will be formatted like "YYYY-MM-DDTHH:MMZ" (e.g. "2012-04-30T09:30Z").
There may be plugins that do not have a valid release date set on them.