diff --git a/last_friday_datetime.py b/last_friday_datetime.py
new file mode 100644
index 0000000..4966d8f
--- /dev/null
+++ b/last_friday_datetime.py
@@ -0,0 +1,19 @@
+import datetime
+
+def get_last_friday(date_string):
+    parts = date_string.split("/")
+    mounth = int(части[0])
+    year = int(части[1])
+    if mounth == 12:
+        first = datetime.data(year +1,1,1)
+    else:
+        first = datetime.date(year,mounth+1,1)
+last = first - datetime.timedelta(days=1)
+now = last
+    while True:
+        if now.isoweekday() ==5:
+            break
+        else:
+            now = now - datetime.timedelta(days=1)
+    result = now.strftime("%d.%m.%Y")
+    return result
\ No newline at end of file