How to change the datetime format in pandas

问题

DOB column sample value is in the format - 1/1/2016 which by default gets converted to object as shown below

DOB       object

Converting to date format

df[\'DOB\'] = pd.to_datetime(df[\'DOB\'])

Date converts to

2016-01-26

dtype is

DOB       datetime64[ns]

Now I want to convert this date format to 01/26/2016 or in any other general date formats. How do I do it?

Whatever the method I try it always shows the date in 2016-01-26 format.

回答1:

You can use dt.strftime if you need to convert datetime to other formats (but note that then dtype of column will be object (string)):

import pandas as pd

df = pd.DataFrame({'DOB': {0: '26/1/2016', 1: '26/1/2016'}})
print (df)
         DOB
0  26/1/2016 
1  26/1/2016

df['DOB'] = pd.to_datetime(df.DOB)
print (df)
         DOB
0 2016-01-26
1 2016-01-26

df['DOB1'] = df['DOB'].dt.strftime('%m/%d/%Y')
print (df)
         DOB        DOB1
0 2016-01-26  01/26/2016
1 2016-01-26  01/26/2016

回答2:

Changing the format but not changing the type:

df['date'] = pd.to_datetime(df["date"].dt.strftime('%Y-%m'))

回答3:

The below code worked for me instead of the previous one - try it out !

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

回答4:

Compared to the first answer, I will recommend to use dt.strftime() first, then pd.to_datetime(). In this way, it will still result in the datetime data type.

For example,

import pandas as pd

df = pd.DataFrame({'DOB': {0: '26/1/2016 ', 1: '26/1/2016 '})
print(df.dtypes)

df['DOB1'] = df['DOB'].dt.strftime('%m/%d/%Y')
print(df.dtypes)

df['DOB1'] = pd.to_datetime(df['DOB1'])
print(df.dtypes)

回答5:

Below code changes to 'datetime' type and also formats in the given format string. Works well!

df['DOB']=pd.to_datetime(df['DOB'].dt.strftime('%m/%d/%Y'))

回答6:

You can try this it'll convert the date format to DD-MM-YYYY:

df['DOB'] = pd.to_datetime(df['DOB'], dayfirst = True)

来源：https://stackoverflow.com/questions/38067704/how-to-change-the-datetime-format-in-pandas

标签

python

string

pandas

datetime

strftime