lstat

#include < sys/types.h >
#include < sys/stat.h >
#include < unistd.h >

#include < time.h >
#include < stdio.h >

int main()
{
    struct stat buf;
    
    if(lstat("file.txt", &buf) < 0){
        perror("lstat");
        return 1;
    }
    
    printf("%s", ctime(&buf.st_mtime));
    return 0;
}