Those look suspiciously like datenums, circa 2005. I'm gonna take a wild guess that 108 is 01:08. I might be completely wrong. If I'm not, use a timetable, and retime:
>> X = [732315 108 1.9193000 1.9193000 1.9193000 1.9193000
732315 113 1.9193000 1.9193000 1.9060000 1.9060000
732315 114 1.9058000 1.9058000 1.9058000 1.9058000
732315 115 1.9060000 1.9061000 1.9060000 1.9060000];
>> T = array2table(X,'VariableNames',{'Date' 'Time' 'X1' 'X2' 'X3' 'X4'});
>> T.Date = datetime(T.Date,'ConvertFrom','datenum');
>> T.Time = hours(floor(T.Time/100)) + minutes(mod(T.Time,100));
>> T.TimeStamp = T.Date + T.Time;
>> T.Date = []; T.Time = [];
>> TT = table2timetable(T)
TT =
4×4 timetable
TimeStamp X1 X2 X3 X4
____________________ ______ ______ ______ ______
03-Jan-2005 01:08:00 1.9193 1.9193 1.9193 1.9193
03-Jan-2005 01:13:00 1.9193 1.9193 1.906 1.906
03-Jan-2005 01:14:00 1.9058 1.9058 1.9058 1.9058
03-Jan-2005 01:15:00 1.906 1.9061 1.906 1.906
>> TT = retime(TT,'minutely')
TT =
8×4 timetable
TimeStamp X1 X2 X3 X4
____________________ ______ ______ ______ ______
03-Jan-2005 01:08:00 1.9193 1.9193 1.9193 1.9193
03-Jan-2005 01:09:00 NaN NaN NaN NaN
03-Jan-2005 01:10:00 NaN NaN NaN NaN
03-Jan-2005 01:11:00 NaN NaN NaN NaN
03-Jan-2005 01:12:00 NaN NaN NaN NaN
03-Jan-2005 01:13:00 1.9193 1.9193 1.906 1.906
03-Jan-2005 01:14:00 1.9058 1.9058 1.9058 1.9058
03-Jan-2005 01:15:00 1.906 1.9061 1.906 1.906
