Datetime rnage verification

Question

After try parsing the datetime out below, i want towrite logic that restrict the user to 45 days from current date or should I say if the datetime is in detween 45 days from the current date then do something else continue, so today is 03/26, 45 days from the 03/26 would be 02/09/12 or 02/08/12. so if datetime is between that range ( 03/26 would be 02/09/12) then i process data or else continue.


                                if (DateTime.TryParseExact(dateTimeConstruct, "yyyyMMdd HHmmss", null, 0, out dateTime))
                                {

                                    if (dateTime.Day > 45)
                                    {
                                      
                                    }
                                   
                                }