How to format cell with datetime object of the form 'yyyy-mm-dd hh:mm:ss' in Excel using openpyxl

Question

So, given:

dttm = datetime.datetime.strptime(\"2014-06-23 13:56:30\", \"%Y-%m-%d %H:%M:%S\")
ws[\'A1\'] = dttm

The result in excel is that

Answer 1

For openpyxl 2.3.4 the NumberFormat cannot be imported, but this code works to set the style:

from openpyxl.styles import Style

…
date_style = Style(number_format="DD/MM/YYYY HH:MM:MM")
ws['A1'].style = date_style