diff --git a/52/gwenllian1136/Pomodoro.py b/52/gwenllian1136/Pomodoro.py
new file mode 100644
index 00000000..bdeeed32
--- /dev/null
+++ b/52/gwenllian1136/Pomodoro.py
@@ -0,0 +1,21 @@
+# countdown alarm
+# set a time e.g. 20 minutes, counts down and then alarm
+
+from datetime import datetime
+from datetime import timedelta
+import time
+
+counter_str=input("How many mins to you want to count down ?")
+counter=int(counter_str)
+
+if counter<=0:
+    counter=1
+now_time=datetime.today()
+the_gap=timedelta(minutes=counter)
+Alarm_time=now_time+the_gap
+
+print('Start time is '+datetime.now().strftime('%H:%M:%S'))
+while datetime.now()<Alarm_time:
+    time.sleep(1)
+
+print('It''s '+ Alarm_time.strftime('%H:%M:%S')+ '. Please Stop!')