First implementation of an atom feed

date.go

@@ -0,0 +1,23 @@
+package atomfeed
+
+import (
+	"errors"
+	"time"
+)
+
+type Date struct {
+	*CommonAttributes
+	DateTime string
+}
+
+func (d *Date) Check() error {
+	if d.DateTime == "" {
+		return errors.New("date time element of date is empty")
+	}
+
+	return nil
+}
+
+func DateTime(t time.Time) string {
+	return string(t.Format(time.RFC3339))
+}