Reporting Time Fixed As A Daily Variable

The previous problem stands solved i.e. ReportTime field shows 9:50 always.But it has created another problem as under

The Formula for ReportTime : Format(Date(),"m/d/yyyy") & " 9:50:00 AM"

The formula for ReportedAt then becomes as ReportedAt: Format(Now(),"hh-nn ampm")

And the next step LateByMinuts:=IIf([StatusID]=1,DateDiff("n",[ReportTime],[ReportedAt]),0)

Where stutusID is

1. Present,
2. AbsentExcused.
3. LeavePrivelege etc.

is correct for the first time.That is when at the first time the Reported time (system time) is recorded it works fantastically but when next time the Form is opened the saved "LateBYMinuts" field is changed with the system date thus disparaging the previous save data.