update Otcheti set OtchetDateDt=FloatToDate(OtchetDate)

GO

if exists (select * from SYSTRIGGERS where LCase(trigname)=lcase('TrigOtchetiUpd'))
  then
  drop trigger TrigOtchetiUpd
end if

go

create trigger TrigOtchetiUpd after insert,update order 1
on "DBA".Otcheti
referencing new as OtchetiNew
for each row
begin
  update Otcheti set OtchetDateDt=FloatToDate(OtchetDate)
    where OtchetNo=OtchetiNew.OtchetNo
end