Pandas: How to create a datetime object from Week and Year?

Question

I have a dataframe that provides two integer columns with the Year and Week of the year:

import pandas as pd
import numpy as np
L1 = [43,44,51,2,5,12]
L2 = [         


        

Answer 1

Like @Gianmario Spacagna mentioned for datetimes higher like 2018 use %V with %G:

L1 = [43,44,51,2,5,12,52,53,1,2,5,52]
L2 = [2016,2016,2016,2017,2017,2017,2018,2018,2019,2019,2019,2019]
df = pd.DataFrame({"Week":L1,"Year":L2})


df['new'] = pd.to_datetime(df.Week.astype(str)+
                           df.Year.astype(str).add('-1') ,format='%V%G-%u')
print (df)
    Week  Year        new
0     43  2016 2016-10-24
1     44  2016 2016-10-31
2     51  2016 2016-12-19
3      2  2017 2017-01-09
4      5  2017 2017-01-30
5     12  2017 2017-03-20
6     52  2018 2018-12-24
7     53  2018 2018-12-31
8      1  2019 2018-12-31
9      2  2019 2019-01-07
10     5  2019 2019-01-28
11    52  2019 2019-12-23