How to Update Table using Left Join between two table?

Question

I have two table one is Employee Table and another one is EmployeeAttendance ,Nowi am trying to update INTIME and OUTTIME in EmployeeAttendance then result of values calculate as per query and condition ..i tried but not getting result..

Update EmployeesAttendance
set EmployeesAttendance.INTIME=@INTime,
EmployeesAttendance.OUTTIME=@OUTTIME
where EmployeesAttendance.AttdID=EmployeesAttendance.AttdID AND
Case When (DATEDIFF(Hour, INTIME,OUTTIME)) = Hours
CASE WHEN EmployeesAttendance.Hours >= 8 THEN 1
WHEN EmployeesAttendance.Hours = 0 THEN 0
WHEN EmployeesAttendance.Hours >= 6 THEN 0.5 =   Day,
CASE WHEN EmployeesAttendance.Hours > EmployeeDetails.Dhour then
EmployeesAttendance .Hours - EmployeesAttendance .Dhour else 0 End = OT,
CASE when EmployeeDetails.OTEntitled = 'Yes'
AND EmployeesAttendance .Hours >= EmployeeDetails.Dhour
THEN (( EmployeesAttendance.Hours - 8) * 100) else 0 END = OTAmount,
Convert(varchar(10), EmployeesAttendance .INTIME,108) = Time,
Case When Convert(Time, EmployeesAttendance .INTIME,108) > cte.LTime Then 1 else 0 end =Late
from EmployeeDetails
Left Join EmployeesAttendance ON EmployeeDetails.EmpId = EmployeesAttendance.EmpID
order by EmployeeDetails.EmpID asc