print "years ago" instead of date when not yearknown

main.go

@@ -7,6 +7,7 @@ import (
 	_ "github.com/mattn/go-sqlite3"
 	"log"
 	"math"
+	"strconv"
 	"time"
 )
 
@@ -63,9 +64,21 @@ func (event *EventsRow) Output() (int64, string, string) {
 		log.Fatal(err)
 	}
 
-	date := time.Unix(timestamp.(int64), 0)
+	yearknown, err := event.yearknown.Value()
+	if err != nil {
+		log.Fatal(err)
+	}
 
-	return timestamp.(int64), date.String(), desc.(string)
+	var ago string
+	date := time.Unix(timestamp.(int64), 0)
+	if yearknown == nil || !yearknown.(bool) {
+		yeardiff := time.Now().Year() - date.Year()
+		ago = strconv.Itoa(yeardiff) + " years ago"
+	} else {
+		ago = date.String()
+	}
+
+	return timestamp.(int64), ago, desc.(string)
 }
 
 func main() {