Limit birthday range with FROM and UNTIL

src/eval/command/birthday.rs

@@ -8,10 +8,12 @@ use super::super::EntryKind;
 
 impl<'a> CommandState<'a> {
     pub fn eval_birthday_spec(&mut self, spec: &BirthdaySpec) {
-        // This could be optimized by restricting the range via FROM and UNTIL,
-        // but I don't think that kind of optimization will be necessary any
-        // time soon.
-        for year in self.range.years() {
+        let range = match self.limit_from_until(self.range) {
+            Some(range) => range,
+            None => return,
+        };
+
+        for year in range.years() {
             let age = if spec.year_known {
                 let age = year - spec.date.year();
                 if age < 0 {