Something like the following may work. You may need to change the header_str and text_scan_format to match your actual file's contents.
% path to the file:
file_name = 'file.txt';
% lines in the file starting with header_str will be skipped:
header_str = 'header';
% format of data lines:
text_scan_format = '%d-%d-%d %d %d %d';
% show file's contents, for reference:
type(file_name);
% initialize an empty datetime array dt and an empty 3-column matrix vals:
dt = NaT(0,1);
vals = zeros(0,3);
% open the file for reading:
fid = fopen(file_name,'r');
% while not at the end of the file:
while ~feof(fid)
% get the next line:
str = fgetl(fid);
% if it starts with header_str, skip it:
if startsWith(str,header_str)
continue
end
% read the date and other values from the line:
temp = textscan(str,text_scan_format);
% put the date in a new elements in the dt array:
dt(end+1,:) = datetime(temp{[3 1 2]}); % year, month, day
% put the other values in a new row in the vals matrix:
vals(end+1,:) = [temp{4:6}];
end
% close the file:
fclose(fid);
% put dt and vals together in a table:
T = addvars(array2table(vals),dt,'Before','vals1')
