Python/Pandas: How to convert from datetime64[ns] to datetime (2024)

In Pandas, when you have a column with dtype datetime64[ns], you already have datetime objects represented internally. However, if you want to explicitly convert a column from datetime64[ns] to Python's built-in datetime.datetime objects, you can achieve this conversion using the to_pydatetime() method. Here's how you can do it:

Example:

Assume you have a DataFrame with a column of datetime64[ns]:

import pandas as pd# Sample DataFramedata = { 'date': ['2023-01-01', '2023-01-02', '2023-01-03'],}df = pd.DataFrame(data)# Convert 'date' column to datetimedf['date'] = pd.to_datetime(df['date'])# Check the dtype of 'date' columnprint("Original dtype:")print(df['date'].dtype)# Convert 'date' column to Python's datetime.datetime objectsdf['date'] = df['date'].dt.to_pydatetime()# Check the dtype of 'date' column after conversionprint("\nConverted dtype:")print(df['date'].dtype)

Output:

Original dtype:datetime64[ns]Converted dtype:datetime64[ns]

Explanation:

  1. DataFrame Creation: We create a sample DataFrame df with a column 'date' containing date strings.

  2. Convert to datetime: pd.to_datetime(df['date']) converts the 'date' column from strings to datetime64[ns] dtype.

  3. Convert to Python's datetime.datetime: df['date'].dt.to_pydatetime() converts the datetime64[ns] objects to Python's datetime.datetime objects.

Notes:

  • After conversion, Pandas still represents the column as datetime64[ns] internally, but you can extract individual datetime.datetime objects from the Series if needed.
  • Converting to datetime.datetime objects can be useful if you need to interact with libraries or functions that explicitly require Python's built-in datetime objects.

Alternative Approach:

If you want to convert a specific value from datetime64[ns] to datetime.datetime, you can access individual values and use the .to_pydatetime() method directly:

import pandas as pd# Sample DataFramedata = { 'date': ['2023-01-01', '2023-01-02', '2023-01-03'],}df = pd.DataFrame(data)# Convert 'date' column to datetimedf['date'] = pd.to_datetime(df['date'])# Convert specific value to datetime.datetimedt_value = df.loc[0, 'date'].to_pydatetime()print("Converted value:", dt_value)print("Type:", type(dt_value))

Output:

Converted value: 2023-01-01 00:00:00Type: <class 'datetime.datetime'>

In this example, df.loc[0, 'date'] retrieves the first datetime value from the 'date' column, and .to_pydatetime() converts it to a datetime.datetime object.

This approach gives you flexibility depending on whether you want to convert the entire column or specific values to datetime.datetime objects in Pandas.

Examples

  1. Python Pandas convert datetime64 to datetime

    • Description: Explains how to convert a datetime column in a Pandas DataFrame from datetime64 format to Python's standard datetime format.
    • Code:
      import pandas as pd# Sample DataFrame with datetime64 columndf = pd.DataFrame({'date_column': ['2023-01-01', '2023-01-02']})df['date_column'] = pd.to_datetime(df['date_column'])# Convert datetime64[ns] to datetimedf['date_column'] = df['date_column'].dt.to_pydatetime()
  2. Pandas convert datetime64 to datetime object

    • Description: Demonstrates how to convert a Pandas datetime column from datetime64 to Python's datetime object for easier manipulation.
    • Code:
      import pandas as pd# Assuming 'date_column' is datetime64[ns]df['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()
  3. Python Pandas datetime64 to datetime conversion

    • Description: Shows a method to convert a datetime column in a Pandas DataFrame from datetime64 format to Python's datetime type for compatibility.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = pd.to_datetime(df['date_column']).apply(lambda x: x.to_pydatetime())
  4. Pandas datetime64 to Python datetime

    • Description: Provides a way to convert a Pandas Series of datetime64 values into Python's datetime format for easier handling of dates.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = df['date_column'].apply(lambda x: x.to_pydatetime())
  5. Convert datetime64[ns] to datetime in Pandas

    • Description: Explains how to convert a datetime column from datetime64 format to Python's datetime object using Pandas library.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()
  6. Python Pandas change datetime64 to datetime

    • Description: Details a method to change the datatype of a datetime column from datetime64[ns] to Python's datetime type in Pandas.
    • Code:
      import pandas as pd# Assuming 'date_column' is datetime64[ns]df['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()
  7. Pandas datetime64[ns] to datetime conversion

    • Description: Illustrates how to convert a Pandas Series containing datetime64[ns] values to Python's datetime objects for easier manipulation.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = df['date_column'].apply(lambda x: x.to_pydatetime())
  8. Python Pandas convert datetime64 to native datetime

    • Description: Shows a method to convert datetime values stored in datetime64 format within a Pandas DataFrame to Python's native datetime format.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()
  9. Convert Pandas datetime64 to Python datetime object

    • Description: Explains how to convert a Pandas DataFrame column containing datetime64 values into Python's datetime objects.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()
  10. Pandas series datetime64 to datetime conversion

    • Description: Provides a method to convert a Pandas Series of datetime64 values into Python's datetime objects for better compatibility.
    • Code:
      import pandas as pd# Convert datetime64[ns] to datetimedf['date_column'] = pd.to_datetime(df['date_column']).dt.to_pydatetime()

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Python/Pandas: How to convert from datetime64[ns] to datetime (2024)
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