import pywikibot
from pywikibot import pagegenerators

import datetime

site = pywikibot.Site(fam='commons', code='commons')
site.throttle.setDelays(10)
cat = pywikibot.Category(site,'Category:Images from Wiki Loves Love 2019')
Sleeping for 5.4 seconds, 2019-02-15 13:49:48
date = datetime.date(2019,2,2)
result_page = pywikibot.Page(site, 'Commons:Wiki Loves Love 2019/image list/{:02d}'.format(date.day))
page = gen.__next__()
page.is_filepage()
True
gen = pagegenerators.CategorizedPageGenerator(cat)

wiki_text = ('{{Commons:Wiki Loves Love 2019/image list/header}}\n'
             '<gallery>\n') 
wiki_text += ' \n'.join(
    [page.title() for page in gen if page.is_filepage() and 
    page.oldest_file_info['timestamp'].date() == date])
wiki_text += '\n</gallery>'
Sleeping for 9.0 seconds, 2019-02-15 14:10:41
Sleeping for 8.8 seconds, 2019-02-15 14:10:51
Sleeping for 8.8 seconds, 2019-02-15 14:11:01
Sleeping for 8.9 seconds, 2019-02-15 14:11:11
result_page.text = wiki_text
result_page.save('Creating or updating daily gallery of Wiki Loves Love 2019 files')
Sleeping for 8.8 seconds, 2019-02-02 11:31:45
Sleeping for 9.9 seconds, 2019-02-02 11:31:54
Sleeping for 9.9 seconds, 2019-02-02 11:32:04
Sleeping for 9.9 seconds, 2019-02-02 11:32:14
Page [[commons:Commons:Wiki Loves Love 2019/image list/02]] saved