showing Time from database in Timepicker directive Angular

I'm using timepicker there is an error to getting data from database : here is what should it be :

VisitDate: "2015-05-21T17:30:00"  

here is what i get :

21:00  



<timepicker ng-model="visitPlaceViewModel.VisitDate" hour-step="hstep" minute-step="mstep" show-meridian="ismeridian" class="timePicker"></timepicker>