How to get start time and end time of a process using Pid in android xamarin

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Mobile

Android

C#5.0

Xamarin

I am able to get pid of the application running in my android device.

ActivityManager activityManager = (ActivityManager)this.GetSystemService (Context.ActivityService);
                IList<Android.App.ActivityManager.RunningTaskInfo> runningTaskInfo = activityManager.GetRunningTasks(int.MaxValue);

for(int ii = 0; ii < runningTaskInfo.Count; ii++)
       {
String taskName = runningTaskInfo.ElementAt<Android.App.ActivityManager.RunningTaskInfo>(ii).BaseActivity.PackageName;

                    PackageManager packageManager = this.PackageManager;

ApplicationInfo app = this.PackageManager.GetApplicationInfo(taskName, 0);

Drawable icon = packageManager.GetApplicationIcon(app);
int Pid= activityManager.RunningAppProcesses.ElementAt<activitymanager.runningappprocessinfo>(ii).Pid;
}
But i am unable to get process information basically start time and end time using Pid.

Can someone please help me ?
Its urgent.