Switch color schemes via command line?

So this was a thing I researched before but I decided that it would be too much work for me to deal with and I decided that I wanted to make my own theme switcher since a full GUI is a little extra for me

#!/usr/bin/env bash

if [ date +%k>17 ]; then
	plasma-apply-colorscheme BreezeDark
else
	plasma-apply-colorscheme BreezeClassic
fi
but unfortunately something doesnt work since i am terrible at bash
theme.sh: line 1: #!/usr/bin/env: No such file or directory
theme.sh: line 3: [: date: unary operator expected
The requested theme "BreezeClassic" is already set as the theme for the current Plasma session