How do format date notation from SQL database to a HTML page using Python Flask

from datetime import datetime

def date(d):
     d =  datetime.strptime(d,"%y-%m-%d %H:%M")
     d.strftime("%d-%m-%y %H:%M")
     return d

app.add_template_filter(date)

from datetime import datetime
import re
new_items = [[i[0], i[1], i[2], i[5].strftime("%d-%m-%y %H:%M"), 
             i[6].strftime("%d-%m-%y %H:%M"), i[7].strftime("%d-%m-%y %H:%M"), 
             i[10].strftime("%d-%m-%y %H:%M"), 
             datetime(*map(int, re.findall('\d+', i[12])[:-1])).strftime("%d-%m-%y %H:%M"),
             i[13]] for i in items]

#[['12345', 'productname', '878', '16-06-21 22:40', '16-06-21 22:40', '16-06-21 22:40', '16-06-21 23:25', '16-06-21 00:25', 0]]

{% for item in items %}
    
        {%for i in item%}
           {{i}}
        {%endfor%}
    
{%endfor%}