python - how to change date format on a list of dates (and retain that date format when saving to excel via openpyxl)?

Python - how to change date format on a list of dates (and retain that date format when saving to excel via openpyxl)?

To change the date format of a list of dates in Python and retain that format when saving to Excel using openpyxl, you can follow these steps:

  1. Import the necessary libraries (datetime for date manipulation and openpyxl for Excel file handling).
  2. Define your list of dates.
  3. Convert the dates to the desired format.
  4. Save the formatted dates to an Excel file using openpyxl.

Here's an example code snippet demonstrating these steps:

import datetime from openpyxl import Workbook from openpyxl.styles import NamedStyle # Example list of dates dates = [ datetime.datetime(2022, 5, 1), datetime.datetime(2022, 6, 15), datetime.datetime(2022, 7, 30) ] # Define the date format you want date_format = "%Y-%m-%d" # Example: YYYY-MM-DD # Convert dates to the desired format formatted_dates = [date.strftime(date_format) for date in dates] # Save to Excel wb = Workbook() ws = wb.active # Write formatted dates to Excel for row, date in enumerate(formatted_dates, start=1): ws.cell(row=row, column=1, value=date) # Apply date format to Excel cells date_style = NamedStyle(name='date_style') date_style.number_format = 'YYYY-MM-DD' # Same as the date format used above for row in ws.iter_rows(min_row=1, max_row=len(formatted_dates), min_col=1, max_col=1): for cell in row: cell.style = date_style # Save the workbook wb.save("formatted_dates.xlsx")

In this code:

  • We import the required modules (datetime and openpyxl).
  • We define a list of dates (dates).
  • We specify the desired date format (date_format).
  • We use list comprehension to convert the dates to the desired format (formatted_dates).
  • We create a new Excel workbook (wb) and a worksheet (ws).
  • We write the formatted dates to the Excel worksheet.
  • We apply the desired date format to the Excel cells using a named style (date_style).
  • Finally, we save the workbook to an Excel file named "formatted_dates.xlsx".

Adjust the date format (date_format) and the Excel file name ("formatted_dates.xlsx") according to your requirements.

Examples

  1. "Python change date format in list"

    Description: Learn how to modify the format of dates within a Python list efficiently.

    # Example list of dates in string format dates = ['2022-01-01', '2022-02-01', '2022-03-01'] # Convert dates to datetime objects and then back to string with new format new_format_dates = [datetime.strptime(date, '%Y-%m-%d').strftime('%d-%m-%Y') for date in dates]

  2. "Python convert date format and save to Excel"

    Description: Understand how to convert date formats and preserve the modified format when saving data to an Excel file using Openpyxl.

    from openpyxl import Workbook from datetime import datetime # Example list of dates in string format dates = ['2022-01-01', '2022-02-01', '2022-03-01'] # Convert dates to desired format new_format_dates = [datetime.strptime(date, '%Y-%m-%d').strftime('%d-%m-%Y') for date in dates] # Create a workbook and sheet wb = Workbook() ws = wb.active # Write dates to Excel for index, date in enumerate(new_format_dates): ws.cell(row=index+1, column=1, value=date) # Save workbook wb.save('dates.xlsx')

  3. "Python change date format in list and write to Excel"

    Description: Combine the process of changing date formats in a list and writing the data to an Excel file in Python.

    from openpyxl import Workbook from datetime import datetime # Example list of dates in string format dates = ['2022-01-01', '2022-02-01', '2022-03-01'] # Convert dates to desired format and save to Excel wb = Workbook() ws = wb.active for index, date in enumerate(dates): formatted_date = datetime.strptime(date, '%Y-%m-%d').strftime('%d-%m-%Y') ws.cell(row=index+1, column=1, value=formatted_date) wb.save('formatted_dates.xlsx')

  4. "Python modify date format in list and export to Excel"

    Description: Export a list of dates with modified formats to an Excel file using Python.

    from openpyxl import Workbook from datetime import datetime # Example list of dates in string format dates = ['2022-01-01', '2022-02-01', '2022-03-01'] # Convert dates to desired format new_format_dates = [datetime.strptime(date, '%Y-%m-%d').strftime('%d-%m-%Y') for date in dates] # Export to Excel wb = Workbook() ws = wb.active for index, date in enumerate(new_format_dates): ws.cell(row=index+1, column=1, value=date) wb.save('dates_formatted.xlsx')

  5. "Python change date string format and save to Excel"

    Description: Transform date strings to a different format and store them in an Excel file using Python.

    from openpyxl import Workbook from datetime import datetime # Example list of dates in string format dates = ['2022-01-01', '2022-02-01', '2022-03-01'] # Convert dates to desired format and save to Excel wb = Workbook() ws = wb.active for index, date in enumerate(dates): formatted_date = datetime.strptime(date, '%Y-%m-%d').strftime('%d-%m-%Y') ws.cell(row=index+1, column=1, value=formatted_date) wb.save('formatted_dates.xlsx')

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