Error using time date table

I have a table with time date hour values as:

I am trying to find the difference between the consecutive time and put in the same table as a new column. I want to keep column name as 'time diff'. I am trying this. Got this error.

time= table2array(Data(:,1));
diff=diff(time);
Data=outerjoin(Data,diff,'MergeKeys',true);

error:

Function 'subsindex' is not defined for values of class 'datetime'.

Any suggestions?

Answer 1

[Peter Perkins]

>> tt = timetable(rand(5,1),'RowTimes',datetime('now')+sort(hours(rand(5,1))))
tt =
  5×1 timetable
            Time             Var1  
    ____________________    _______
    11-Mar-2019 11:11:25    0.81472
    11-Mar-2019 11:22:16    0.90579
    11-Mar-2019 11:38:23    0.12699
    11-Mar-2019 12:03:01    0.91338
    11-Mar-2019 12:03:28    0.63236
>> tt.TimeDiff = [NaN; diff(tt.Time)]
tt =
  5×2 timetable
            Time             Var1      TimeDiff
    ____________________    _______    ________
    11-Mar-2019 11:11:25    0.81472         NaN
    11-Mar-2019 11:22:16    0.90579    00:10:51
    11-Mar-2019 11:38:23    0.12699    00:16:06
    11-Mar-2019 12:03:01    0.91338    00:24:38
    11-Mar-2019 12:03:28    0.63236    00:00:26