diff --git a/Day31-35/code/dayofyear.py b/Day31-35/code/dayofyear.py
new file mode 100644
index 0000000..2894c9f
--- /dev/null
+++ b/Day31-35/code/dayofyear.py
@@ -0,0 +1,21 @@
+import sys
+import mycal
+
+
+def main():
+    if len(sys.argv) != 4:
+        print('Not enough arguments')
+        return 
+    year = int(sys.argv[1])
+    month = int(sys.argv[2])
+    day = int(sys.argv[3])
+    total = 0
+    for m in range(1, month):
+        total += mycal.get_days(year, m)
+    total += day
+    print(f'{year}年{month}月{day}日是{year}年的第{total}天')
+
+
+if __name__ == '__main__':
+    main()
+
diff --git a/Day31-35/code/guess.py b/Day31-35/code/guess.py
new file mode 100644
index 0000000..44950f4
--- /dev/null
+++ b/Day31-35/code/guess.py
@@ -0,0 +1,20 @@
+#!/usr/bin/python3
+# coding: utf-8
+from random import randint
+
+
+def main():
+    answer = randint(1, 100)
+    while True:
+        number = int(input('请输入: '))
+        if number < answer:
+            print('大一点')
+        elif number > answer:
+            print('小一点')
+        else:
+            print('恭喜你猜对了!')
+            break
+
+
+if __name__ == '__main__':
+    main()
diff --git a/Day31-35/code/josephu.py b/Day31-35/code/josephu.py
new file mode 100644
index 0000000..8806299
--- /dev/null
+++ b/Day31-35/code/josephu.py
@@ -0,0 +1,22 @@
+def main():
+    persons = [True] * 30
+    counter = 0
+    index = 0
+    number = 0
+    while counter < 15:
+        if persons[index]:
+            number += 1
+            if number == 9:
+                persons[index] = False
+                number = 0
+                counter += 1
+        index += 1
+        index %= len(persons)
+    for person in persons:
+	    print('基' if person else '非', end='')
+    print()
+
+
+if __name__ == '__main__':
+    main()
+
diff --git a/Day31-35/code/mycal.py b/Day31-35/code/mycal.py
new file mode 100644
index 0000000..5738e87
--- /dev/null
+++ b/Day31-35/code/mycal.py
@@ -0,0 +1,46 @@
+#!/usr/bin/python3
+from datetime import datetime
+import sys
+
+
+def is_leap(year):
+    return year % 4 == 0 and year % 100 != 0 or year % 400 == 0
+
+
+def get_days(year, month):
+    days = [[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
+            [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]]
+    return days[is_leap(year)][month - 1]
+
+
+def main():
+    if len(sys.argv) > 1:
+        month = int(sys.argv[1])
+        year = int(sys.argv[2])
+    else:
+        current_date = datetime.now()
+        year = current_date.year
+        month = current_date.month
+    year2 = year if month >= 3 else year - 1
+    c = year2 // 100
+    y = year2 % 100
+    m = month if month >= 3 else month + 12
+    w = y + y // 4 + c // 4 - 2 * c + 26 * (m + 1) // 10
+    w %= 7
+    months = ['January', 'February', 'March', 'April', 'May', 'June',
+              'July', 'August', 'September', 'October', 'November', 'December']
+    print(f'{months[month - 1]} {year}'.center(20))
+    print('Su Mo Tu We Th Fr Sa')
+    print(' ' * 3 * w, end='')
+    total_days = get_days(year, month)
+    for day in range(1, total_days + 1):
+        print(f'{day}'.rjust(2), end=' ')
+        w += 1
+        if w == 7:
+            print()
+            w = 0
+    print()
+
+
+if __name__ == '__main__':
+    main()