Sorting arrays by date with datetime in python 3.10

Question

I have tried all sorts of code but none of it works so far, this is as close as I have gotten all of them get a similar error

Heres the data i want to sort

{'15/2/2022': 'C:\\Users\\me\\filelocation\\Stuff\\codestuff\\Python\\PDF\\files\\paySlip15Febuary.pdf', 
'18/1/2022':' C:\\Users\\me\\filelocation\\Stuff\\codestuff\\Python\\PDF\\files\\paySlip18January.pdf' }
and so on

This is the code i am using currently, but i have tried much more

def key(s):
    fmt = "%d-%m-%Y"
    s = ''.join(s.rsplit(':', 1))  # remove colon from offset
    return datetime.strptime(s, fmt)     

sorted(dates.values(), key=key) 

No matter how many different things i try i get this error. Btw if you are wondering i am creating an array of dates from a list

raise ValueError("time data %r does not match format %r" %

Answer 1

Sorry guys here is the correct answer

from datetime import datetime
sorted = OrderedDict(sorted(dates.items(), key = lambda x:datetime.strptime(x[0], '%d/%m/%Y'), reverse=True))