pass datetime string in the url

Hello :

I am trying to pass, date time string in a url, but I am getting the 400: bad request error.

string dte = (EffectiveDate.Replace('/', '-'));

// DateTime.Parse(EffectiveDate).ToString("s");

http://localhost:59887/Customer/Program/CustomerNumber/2059656/EffectiveDate/2014-02-01%2000%3A01%3A00/UserName/username/Culture/en-US

Effective date in this format is giving me issues, I tried EffectiveDate/2014-02-01T00:01:00 but still not helping. 

Please kindly give some suggestions on what format to use that would work in the url.

Thank you,

Sushma