sh script under debian time dependence - bash

Question

I've build very simple sh script with curl "url" action ( lights control ) for example when I start playing movie lighits are going off, when movie pause are turnig on. I wanna ask You for help how to build this script...
I want this to check what time is and than if it's day light time for example till 4pm lights will stay turned OFF but after 4 pm lights will response.
I did little research and found time checking command: HOUR=$(date +"%k")
So if I'm thinking right what is impossibl :) I need something like:
#!/bin/sh
HOUR=$(date +"%k")
if (( HOUR >= 7am && HOUR <= 4pm ))
curl "URL 1 lights control not included"
else
curl "URL 2 lights control incuded"
fi
Thank You in advance and sorry for my English.

Answer 1

Good old case to the rescue.
#!/bin/sh
case $(date +"%H") in
0[7-9] | 1[0-5] ) url="URL 1 lights control not included" ;;
* ) url="URL 2 lights control incuded" ;;
esac
curl "$url"
The expression matches 07:00:00 through 15:59:59; if you intend for it to match until 16:59:59, the change should be obvious.

Answer 2

Separate light actions and movie actions.
When pausing movie, check if current hour is greater than or equal to enable_lights_at. If yes, turn lights on and pause the movie. When playing movie - first turn the lights off.
#!/bin/bash
#
enable_lights_at=16
lights_turn_off() {
echo "Turning lights OFF";
curl "URL LIGHTS OFF"
}
lights_turn_on() {
echo "Turning lights ON";
curl "URL LIGHTS ON"
}
movie_play() {
echo "Playing movie";
lights_turn_off;
curl "URL PLAY MOVIE"
}
movie_pause() {
echo "Pausing movie";
current_hour=$(date "+%k")
if [ "$current_hour" -ge "$enable_lights_at" ];
then
lights_turn_on;
fi
curl "URL PAUSE MOVIE"
}
case "$1" in
'play')
movie_play;
;;
'pause')
movie_pause;
;;
*)
echo "Usage: $0 {play|pause}"
;;
esac
Worth checking:
http://tldp.org/LDP/abs/html/comparison-ops.html