diff --git a/devel/210_16.md b/devel/210_16.md
new file mode 100644
index 00000000..a2e09f21
--- /dev/null
+++ b/devel/210_16.md
@@ -0,0 +1,15 @@
+# [210_16] srfi-19 date-year-day 添加测试
+
+## 添加 srfi-19 date-year-day 添加测试
+
+## 如何测试
+
+```shell
+# 可能需要清除缓存
+# rm .xmake/ build/ -r
+xmake f -vyD
+xmake b goldfish
+./bin/goldfish tests/goldfish/liii/time-test.scm
+```
+
+
diff --git a/goldfish/srfi/srfi-19.scm b/goldfish/srfi/srfi-19.scm
index 70ff4b05..23815a27 100644
--- a/goldfish/srfi/srfi-19.scm
+++ b/goldfish/srfi/srfi-19.scm
@@ -74,6 +74,7 @@
     make-date date?
     date-nanosecond date-second date-minute date-hour
     date-day        date-month  date-year   date-zone-offset
+    date-year-day
     ;; Time/Date/Julian Day/Modified Julian Day Converters
     time-utc->date date->time-utc
     ;; Date to String/String to Date Converters
diff --git a/tests/goldfish/liii/time-test.scm b/tests/goldfish/liii/time-test.scm
index 011b8dba..b769406d 100644
--- a/tests/goldfish/liii/time-test.scm
+++ b/tests/goldfish/liii/time-test.scm
@@ -796,6 +796,18 @@ wrong-type-arg
   (check (date-year d) => 2000)
   (check (date-zone-offset d) => -14400))
 
+;; Test date-year-day
+(let ((d1 (make-date 0 0 0 0 1 1 2023 0))   ; non-leap year
+      (d2 (make-date 0 0 0 0 1 3 2023 0))
+      (d3 (make-date 0 0 0 0 1 3 2024 0))   ; leap year
+      (d4 (make-date 0 0 0 0 31 12 2023 0))
+      (d5 (make-date 0 0 0 0 31 12 2024 0)))    ; negative year
+  (check (date-year-day d1) => 1)
+  (check (date-year-day d2) => 60)
+  (check (date-year-day d3) => 61)
+  (check (date-year-day d4) => 365)
+  (check (date-year-day d5) => 366))
+
 ;; Test error conditions
 (check-catch 'wrong-type-arg (date-nanosecond "not-a-date"))
 (check-catch 'wrong-type-arg (date-second 123))