創建從今年大熊貓datetime和儒略日

Question

    ad_name adl_name year JD 
0 united_states_of_america colorado 2000 1 
1 united_states_of_america colorado 2000 2 
2 united_states_of_america colorado 2000 3 
3 united_states_of_america colorado 2000 4 
4 united_states_of_america colorado 2000 5 

如何添加使用year和JD（儒略日）列的日期時間列？我試圖用：

pd.to_datetime(df, format='%Y_%d')，但不起作用

Answer 1

您需要添加到year列JD轉換to_timedelta：

df['date'] = pd.to_datetime(df.year, format='%Y') + pd.to_timedelta(df.JD - 1, unit='d') 
print (df) 
        ad_name adl_name year JD  date 
0 united_states_of_america colorado 2000 1 2000-01-01 
1 united_states_of_america colorado 2000 2 2000-01-02 
2 united_states_of_america colorado 2000 3 2000-01-03 
3 united_states_of_america colorado 2000 4 2000-01-04 
4 united_states_of_america colorado 2000 5 2000-01-05 

樣品與JD=32和JD=366：

print (df) 
        ad_name adl_name year JD 
0 united_states_of_america colorado 2000 32 
1 united_states_of_america colorado 2000 366 

df['date'] = pd.to_datetime(df.year, format='%Y') + pd.to_timedelta(df.JD - 1, unit='d') 
print (df) 
        ad_name adl_name year JD  date 
0 united_states_of_america colorado 2000 32 2000-02-01 
1 united_states_of_america colorado 2000 366 2000-12-31