example datetime csv sorted

import csv
from io import StringIO  # just for demo purposes
from collections import defaultdict
from collections import namedtuple
from datetime import datetime

data = """Name,Surname,Department,Start Date
Bradley,Chandler,Accounting,2020-04-26
Dean,Gilmore,Accounting,2018-01-10
Lucius,Glass,Advertising,2019-01-13
Cailin,Mills,Data Analysis,2018-07-27
Audra,Cobb,Research and Development,2018-05-05
Desiree,Delacruz,Data Analysis,2018-05-05
Alfreda,Ryan,DevOps,2018-07-13
Hamilton,Manning,Media Relations,2018-03-09
Lyle,Schultz,Legal Department,2020-01-08"""

dates = defaultdict(list)

with StringIO(data) as records:
    reader = csv.reader(records)
    header = next(reader)[:-1]
    Person = namedtuple('Person', header)
    for record in reader:
        startdate = datetime.strptime(record[-1], '%Y-%m-%d')
        dates[startdate].append(Person(*record[:-1]))
for date in sorted(dates):
    records = dates[date]
    print(f'Date: {date.strftime("%Y-%m-%d")}:')
    for record in records:
        print('\t', end="")
        for field in header:
            print(f'{getattr(record, field):15}', end= ' ')
        print()