Datepicker Timespan

Radzen Studio Blazor Server
1

Running into a road block. I have two datepickers showing time in 12 hour format. I am trying to find the TimeSpan between the two. I have tried several iterations of Timespan
TimeSpan diff = ${endtime}-${starttime};
TimeSpan diff = ${endtime.Subtract(${starttime})};
${endtime}-${starttime}

Nothing seems to work...can someone tell me what I am missing.
endtime is set as DateTime?
starttime is set as DateTime?
they are both set properties from a SQL database
bdc.Time_In (datetime)
bdc_Time_Out (datetime)

Thanks in advance for any help

2

You might need to check this thread:
https://social.msdn.microsoft.com/Forums/vstudio/en-US/2b0f9ae4-51e3-43fe-b8e5-4dd8f581d3df/using-datetime-to-calculate-time-between-two-dates?forum=csharpgeneral