SQL Function Convert INT To DATETIME

I have SQL table with dateTime field which is INT type (This field contains a number representing DATE / TIME)

I would like to convert this umber to actuall date time output. However, SQL gives invalid date times. See below) 

Appears the resulting date time are all the same.

                    SQL COMMAND

                                Select TimeStamp, cast(convert(TimeStamp,103) As datetime) from winsData2

                    OUTPUT

                                 TimeStamp    Converted TimeStamp

                                 2147483647 1900-01-01 00:00:00.343
                                 2147483647 1900-01-01 00:00:00.343
                                 1178694066 1900-01-01 00:00:00.343
                                 2147483647 1900-01-01 00:00:00.343
                                 1178688211 1900-01-01 00:00:00.343
                                 1178828143 1900-01-01 00:00:00.343
                                  2147483647 1900-01-01 00:00:00.343


Any assitance appreciated.