How to set build date in Gulp in Twig template and transfer to folder?

Question

Twig

Hello, straight to the task, now I just copy the twig templates to the folder I need, the task is to automatically enter the date of its assembly into the template and after that copy the template (twig, not assembled html) to the directory with the project. Has anyone faced a similar issue?
Now I do this:

/**
 * Copy Twigs design
 */
gulp.task('design:build', function ()
{
    gulp.src(FilePaths.source.design)
        .pipe(gulp.dest(FilePaths.build.design))
        .pipe(copy())
        .pipe(reload({stream: true}));
});

I would like to do this, in the template specify __BUILD_DATE__ where the build date will be substituted
Template build: {{ __BUILD_DATE__ }}