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我有一个ValueError: year is out of range python用于在时间序列上绘制曲线拟合的以下代码。

谁能向我解释为什么我会收到这个错误？

x_values_formatted=[]

for i in x_values_edited:
    x_values_formatted.append(time.mktime(i.timetuple()))

poly = np.polyfit(x_values_formatted, y_values, 3)

polynomial = np.poly1d(poly)

xs = np.linspace(np.min(x_values_formatted), np.max(x_values_formatted), len(x_values_formatted))

y_int = polynomial(xs)

plt.plot(x_values_edited, y_values, '.')

**plt.plot(xs, y_int)**

plt.show()

数据样本：

所有输入的长度为 1400

x_values_formatted：

[1420088220.0, 1420088160.0, 1420088100.0, 1420088040.0, 1420087980.0, 1420087920.0, 1420087860.0, 1420087800.0, 1420088340.0, 1420088280.0, 1420130940.0, 1420130880.0, 1420130820.0, 1420130760.0, 1420130700.0..

y_values：

[79.5、79.5、80.0、80.25、81.5、81.5、84.25、83.0、79.5、77.0、88.5、89.0、89.0、88.0、89.5、88.75、88.75、90.0 , 80.0,

xs:

[ 1.42006320e+09 1.42006326e+09 1.42006332e+09 ..., 1.42014942e+09 1.42014948e+09 1.42014954e+09]

y_int：

[ 71.45402408 71.48215866 71.51025748 ..., 74.95840454 74.93510818 74.91177654]

x_values_edited

[datetime.datetime(2015, 1, 1, 6, 57), datetime.datetime(2015, 1, 1, 6, 56), datetime.datetime(2015, 1, 1, 6, 55), datetime.datetime( 2015, 1, 1, 6, 54), datetime.datetime(2015, 1, 1, 6, 53), datetime.datetime(2015, 1, 1, 6, 52),

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