str.endswith Output Query

[buran]

where the Date begins with the 6th Day of the month

The Date's for the Data are in the format :%d-%b-%Y

not sure what you mean by "begins" with 6th day of the month", when format ends with year, so endswith should return if year ends with '-6' or '-8'

spam = 'foo-6', 'foo-5', 'foo-8'
for egg in spam:
    if egg.endswith(('-6', '-8')):
        print(egg)

Output:
foo-6
foo-8

maybe give us runable example, including some sample data, that reproduce the problem.