id3v2: try to parse the year when 'year' tag could be a date (#104)

Co-authored-by: David Howden <dhowden@gmail.com>

.github/workflows/go.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.18
+        go-version: "1.20"
         cache: true
 
     - name: Build

go.mod

@@ -1,6 +1,6 @@
 module github.com/dhowden/tag
 
-go 1.18
+go 1.20
 
 require github.com/dhowden/itl v0.0.0-20170329215456-9fbe21093131
 

id3v2metadata.go

@@ -7,6 +7,7 @@ package tag
 import (
 	"strconv"
 	"strings"
+	"time"
 )
 
 type frameNames map[string][2]string
@@ -89,8 +90,18 @@ func (m metadataID3v2) Genre() string {
 }
 
 func (m metadataID3v2) Year() int {
-	year, _ := strconv.Atoi(m.getString(frames.Name("year", m.Format())))
-	return year
+	stringYear := m.getString(frames.Name("year", m.Format()))
+
+	if year, err := strconv.Atoi(stringYear); err == nil {
+		return year
+	}
+
+	date, err := time.Parse(time.DateOnly, stringYear)
+	if err != nil {
+		return 0
+	}
+
+	return date.Year()
 }
 
 func parseXofN(s string) (x, n int) {