Date Variables and URL Parameters

[snippsat]

Use code tag,i have added tags now.

populate a list containing all dates
in that range and then update my urldate parameter by looping through that list.

Looks like you would need a loop,you don't show example of how data looks so hard to say.
Eg:

lst = ['21:23:10', '21:23:20', '21:23:30']
url = 'http://something.io/{}'
for d in lst:
    # Need to do server call inside loop
    # Can also set time delay between calls
    print(url.format(d))

Output:
http://something.io/21:23:10
http://something.io/21:23:20
http://something.io/21:23:30