Timepicker save 12h to 24 hours Format

Timepicker save 12h to 24 hours Format

I'm having problem on saving the value of the Time Picker of Kendo to 24
Hours Format , Timepicker shows "HH:mm tt" format but i want to convert it
to "HH:mm:ss" , I use Time Span for my drowdown list
Sample Codes
//having error because Endtime's value is "HH:mm tt"
client.EndTime = TimeSpan.Parse(endTime.Trim());
client.EndTime = new DateTime(endTime).ToString("HH:mm");
client.EndTime
=TimeSpan.ParseExact(endTime,"hh\\:mm\\:ss",CultureInfo.InvariantCulture);