# Convert matrix with 3 columns ([day month year]) into one string dd/mm/yyyy with each part taking value of one column

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Loriann Chevalier on 15 Apr 2022
Commented: Loriann Chevalier on 15 Apr 2022
Hello everybody,
I have a matrix Nx3 called Date with 3 columns describing "random" dates. First column is day, second is month and third is year, like this :
1 3 1981
28 3 1982
23 3 1983
9 5 1984
27 3 1985
15 2 1986
19 2 1987
16 4 1988
20 3 1989
etc.
I want to write a vector with one single column that has the form :
01/03/1981
28/03/1982
23/03/1983
etc.
I tried to use the datestr() function like this :
datestr(Date,'dd/mm/yyyy')
but it returns me a vector of length Nx3 (i.e. size 3Nx1) :
'01/01/0000'
'28/01/0000'
'23/01/0000'
'09/01/0000'
'27/01/0000'
'15/01/0000'
'19/01/0000'
'16/01/0000'
'20/01/0000'
'02/01/0000'
etc.
I do not understand what is wrong with datestr().
Is there another function that would put all the 3 columns in one, and adding a zero in front of the numbers of days or months with only one digit (i.e. also write 1 as 01) ?
Cheers

Arif Hoq on 15 Apr 2022
Edited: Arif Hoq on 15 Apr 2022
try this:
A=[1 3 1981
28 3 1982
23 3 1983
9 5 1984
27 3 1985
15 2 1986
19 2 1987
16 4 1988
20 3 1989];
T=table(A(:,1),A(:,2),A(:,3));
B=string(A);
C=strcat(B(:,1),'/',B(:,2),'/',B(:,3));
D=datetime(C,'format','dd/M/yyyy')
D = 9×1 datetime array
01/3/1981 28/3/1982 23/3/1983 09/5/1984 27/3/1985 15/2/1986 19/2/1987 16/4/1988 20/3/1989
Loriann Chevalier on 15 Apr 2022
It works perfectly, thank you very much :)