I got wrong data when i use datetime convertfrom

Hi I attached time(year:1999) data. It was nc data so when I use ncdisp, its units = 'hours since 1800-01-01 00:00:0.0'

I tried to convert it by

t=datetime(time,'Convertfrom',datenum);

And I got the answer like

'4780-11-26'

'4780-12-20'

.

.

.

Yeah it is wrong.

How can I get proper 1999 date?

Answer 1

[Stephen23]

S = load('time.mat');
D = S.time

D = 365×1

1744392 1744416 1744440 1744464 1744488 1744512 1744536 1744560 1744584 1744608

T = datetime(1800,1,1) + hours(D)

T = 365×1 datetime array
   01-Jan-1999
   02-Jan-1999
   03-Jan-1999
   04-Jan-1999
   05-Jan-1999
   06-Jan-1999
   07-Jan-1999
   08-Jan-1999
   09-Jan-1999
   10-Jan-1999
   11-Jan-1999
   12-Jan-1999
   13-Jan-1999
   14-Jan-1999
   15-Jan-1999
   16-Jan-1999
   17-Jan-1999
   18-Jan-1999
   19-Jan-1999
   20-Jan-1999
   21-Jan-1999
   22-Jan-1999
   23-Jan-1999
   24-Jan-1999
   25-Jan-1999
   26-Jan-1999
   27-Jan-1999
   28-Jan-1999
   29-Jan-1999
   30-Jan-1999

[주희 박]

Thank you so much! It works well:)

Answer 2

[Walter Roberson]

dt = hours(t) + datetime('1800-01-01 00:00:0.0')