Implement originalReleaseDate in OpenSubsonic responses. (#2733)

See https://github.com/opensubsonic/open-subsonic-api/pull/80

server/subsonic/helpers.go

@@ -7,6 +7,7 @@ import (
 	"mime"
 	"net/http"
 	"sort"
+	"strconv"
 	"strings"
 
 	"github.com/navidrome/navidrome/consts"
@@ -244,6 +245,24 @@ func childrenFromAlbums(ctx context.Context, als model.Albums) []responses.Child
 	return children
 }
 
+// toItemDate converts a string date in the formats 'YYYY-MM-DD', 'YYYY-MM' or 'YYYY' to an OS ItemDate
+func toItemDate(date string) responses.ItemDate {
+	itemDate := responses.ItemDate{}
+	if date == "" {
+		return itemDate
+	}
+	parts := strings.Split(date, "-")
+	if len(parts) > 2 {
+		itemDate.Day, _ = strconv.Atoi(parts[2])
+	}
+	if len(parts) > 1 {
+		itemDate.Month, _ = strconv.Atoi(parts[1])
+	}
+	itemDate.Year, _ = strconv.Atoi(parts[0])
+
+	return itemDate
+}
+
 func buildItemGenres(genres model.Genres) []responses.ItemGenre {
 	itemGenres := make([]responses.ItemGenre, len(genres))
 	for i, g := range genres {
@@ -301,5 +320,6 @@ func buildAlbumID3(ctx context.Context, album model.Album) responses.AlbumID3 {
 	dir.MusicBrainzId = album.MbzAlbumID
 	dir.IsCompilation = album.Compilation
 	dir.SortName = album.SortAlbumName
+	dir.OriginalReleaseDate = toItemDate(album.OriginalDate)
 	return dir
 }