save a matfile with date and time

I want to save a matfile name optimization with the name Project and add time in addition to the name like Project_20/03/2019.mat. Please how do i do it. I tried this but it didnt work

time = datestr(now, 'yyyy_mm_dd');
 filename = sprintf('Optimization_%s.mat',time)
save ('C:\dannyuser\Project',filename,datestr(now))

Answer 1

[Walter Roberson]

save( fullfile('C:\dannyuser\Project', filename) )

If you want the time to be put in as well as part of the file name, do so as part of that sprintf() you have.

[Daniel Boateng]

It worked but the problem now is, it is saving all the variables and fields in my matlab workspace as Optimisation instead of only optimisation variable. Is there any help please

[Walter Roberson]

save( fullfile('C:\dannyuser\Project', filename), 'NameOfYourOptimizationVariable')

[Daniel Boateng]

it works. Thank you very much