how to check if the folder name start with "PDF " + date using python

I have a python script that list folder and files existing in a given path.

What i want is to be able to check if the existing folder start with string "pdf" + date like this: pdf 18-19-06-2020. If the folder start with just pdf and the date is not in the format "dd-dd-mm-yyyy" i need to convert the name to the required format.

I am getting the current date and the date of yesterday.

code:

#packages for list and copy folders & files.
import calendar
import os
import shutil
from os import path
from datetime import date

def main():
    copy(src)

'''
FUNCTION THAT calculate current date and 2 dates before   
'''


def yesterday():
    days=[]
    day = int(date.today().strftime("%d"))
    month = int(date.today().strftime("%m"))
    year = int(date.today().strftime("%Y"))
    if day != 1:
        p = day -1
        p1 = day -2
        p2 = day -3

        print("******",p)
        print("******",p1)
        print("******",p2)
        days.append(p)
        days.append(p1)
        days.append(p2)
        print("******",days,"********")
        return p
    else:
        p = 32 -1
        print("******",p)
        return p
    long_months = [1, 3, 5, 7, 8, 10, 12]
    if month in long_months:
        print(32 -1)
        return(32-1) 
    elif month == 2:
        if calendar.isleap(year):
            return 29
        return 28
    else:
        return 30

dst = "E:/KRD2018_Data"
dst2 = "F:/ABpro" 
dst3 = "C:/Users/cvd/Documents"
'''
FUNCTION THAT list the folders and files exist on the USB drive and copy the pdfs and docs to their destinations 
and copy the pdfs in the existing folder to the specified destination
'''
def copy(src):

    #name = folder pdf yesterday + today

    #pdf dd-dd-mm-yyyy ==> 3-04-05-2020
    datefile = "pdf " + str(yesterday()) + date.today().strftime("-%d-%m-%Y")
    src2 = os.path.join(src, datefile)
    ignore_list=["$RECYCLE.BIN","System Volume Information"]

    i=0
    j=0
    z=0

    for dirpath, dirnames, files in os.walk(src, topdown=True):         
        print(f'Found directory: {dirpath}')
        if len(dirnames)==0 and len(files)==0:
            print("this directory is empty")
            continue
        # exclude the ignore list from the os.walk
        dirnames[:] = [d  for d in dirnames if d not in ignore_list]
        # check if the path is directory
        isdir  = os.path.isdir(dirpath)
        print(isdir)


        for  file in files:
            full_file_name = os.path.join(dirpath, file)
            if os.path.join(dirpath) == src:
                if file.endswith("pdf"):
                    if not os.path.exists(dst2):
                        os.mkdir(dst2)
                    else:
                        print("the path alredy exist")
                    # shutil.copy(full_file_name, dst2)
                    i+=1

                elif file.endswith("docx") or file.endswith("doc"):
                    # shutil.copy(full_file_name, dst)
                    j+=1

            elif os.path.join(dirpath)== src2:
                if file.endswith("pdf"):
                    numfile = len(files)

                    # shutil.copy(full_file_name, dst3)
                    z+=1
        print("*******number of directories = {}".format(len(dirnames)))
        print("*******number of files = {}".format(len(files)))
    print("{} word file \n".format(j))
    print("{} pdf files \n".format(z))
    print("{} other files \n".format(i))
    print("total copied files {}".format(i+j+z))
if __name__=="__main__":
    main()