导入库
```python
import turtle
import datetime
```
创建表针形状
```python
def mkHand(hand_length, hand_color):
turtle.penup()
turtle.goto(-hand_length / 2, hand_length / 2)
turtle.pendown()
turtle.color(hand_color)
turtle.begin_poly()
for _ in range(12):
turtle.forward(hand_length / 2)
turtle.right(30)
turtle.end_poly()
return turtle.get_poly()
```