pd.to_datetime is getting half my dates with flipped day / months

Question

My dataset has dates in the European format, and I\'m struggling to convert it into the correct format before I pass it through a pd.to_datetime, so for all day < 12, my

Answer 1

Add format.

df['Date'] = pd.to_datetime(df['Date'], format='%d/%m/%Y') 

Answer 2

You can control the date construction directly if you define separate columns for 'year', 'month' and 'day', like this:

import pandas as pd
df = pd.DataFrame(
    {'Date': ['01/03/2018', '06/08/2018', '31/03/2018', '30/04/2018']}
)
date_parts = df['Date'].apply(lambda d: pd.Series(int(n) for n in d.split('/')))
date_parts.columns = ['day', 'month', 'year']
df['Date'] = pd.to_datetime(date_parts)

date_parts
#    day  month  year
# 0    1      3  2018
# 1    6      8  2018
# 2   31      3  2018
# 3   30      4  2018

df
#         Date
# 0 2018-03-01
# 1 2018-08-06
# 2 2018-03-31
# 3 2018-04-30