convert C# code to java

Hi Team,

I am newbie here and stuck on quite small problem where there is a requirement to convert c# code to the java code.
This c# code works fine but I need to use this is java where it doesn't work. Please help

TimeSpan time = new TimeSpan(2, 0, 0, 0);
TimeSpan endtime = new TimeSpan(2, 3, 0, 0);
string start_date = DateTime.Now.Add(time).ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
String end_date = DateTime.Now.Add(endtime).ToString("yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture);
String payload = "{\"end_date\": \""+end_date+"\",\"start_date\": \""+start_date+"\"}";

Looking forward to hearing from you experts.

Satmisha