How to combine multiple columns in a Data Frame to Pandas datetime format

Question

I have a pandas data frame with values as below

ProcessID1 UserID Date Month Year Time 248 Tony 29 4 2017 23:30:56 436 Jeff 28 4 2017 20:02:19 500 Greg 4 5 2017 11:48:29 I would like to know is there any way I can combine columns of Date,Month&Year & time to a pd.datetime format?

Answer 1

Use to_datetime with automatic convert column Day,Month,Year with add time s converted to_timedelta :

df['Datetime'] = pd.to_datetime(df.rename(columns={'Date':'Day'})[['Day','Month','Year']]) + \
                 pd.to_timedelta(df['Time'])

Another solutions are join all column converted to string s first:

df['Datetime'] = pd.to_datetime(df[['Date','Month','Year', 'Time']]
                   .astype(str).apply(' '.join, 1), format='%d %m %Y %H:%M:%S')

df['Datetime']  = (pd.to_datetime(df['Year'].astype(str) + '-' +
                                  df['Month'].astype(str) + '-' +
                                  df['Date'].astype(str) + ' ' +
                                  df['Time']))

---

print (df)
   ProcessID1 UserID  Date  Month  Year      Time            Datetime
0         248   Tony    29      4  2017  23:30:56 2017-04-29 23:30:56
1         436   Jeff    28      4  2017  20:02:19 2017-04-28 20:02:19
2         500   Greg     4      5  2017  11:48:29 2017-05-04 11:48:29

Last if need remove these columns:

df = df.drop(['Date','Month','Year', 'Time'], axis=1)
print (df)
   ProcessID1 UserID            Datetime
0         248   Tony 2017-04-29 23:30:56
1         436   Jeff 2017-04-28 20:02:19
2         500   Greg 2017-05-04 11:48:29

Answer 2

import pandas as pd

You can also do this by using apply() method:-

df['Datetime']=df[['Year','Month','Date']].astype(str).apply('-'.join,1)+' '+df['Time']

Finally convert 'Datetime' to datetime dtype by using pandas to_datetime() method:-

df['Datetime']=pd.to_datetime(df['Datetime'])

Output of df :

    ProcessID1  UserID   Date   Month   Year    Time        Datetime
0   248          Tony     29    4       2017    23:30:56    2017-04-29 23:30:56
1   436          Jeff     28    4       2017    20:02:19    2017-04-28 20:02:19
2   500          Greg      4    5       2017    11:48:29    2017-05-04 11:48:29

Now if you want to remove 'Date' , 'Month' , 'Year' and 'Time' column then use:-

df=df.drop(columns=['Date','Month','Year', 'Time'])