Sets the date pointed to by value corresponding to the date of the
given field. Caller is responsible for making sure the field exists
and has the correct type.
On success value will point to a newly-allocated copy of the date which
should be freed with g_date_free() when no longer needed (note: this is
inconsistent with e.g. gst_structure_get_string() which doesn't return a
copy of the string).
TRUE if the value could be set correctly. If there was no field with fieldname or the existing field did not contain a data, this function returns FALSE.
Sets the date pointed to by value corresponding to the date of the given field. Caller is responsible for making sure the field exists and has the correct type. On success value will point to a newly-allocated copy of the date which should be freed with g_date_free() when no longer needed (note: this is inconsistent with e.g. gst_structure_get_string() which doesn't return a copy of the string).