Casting bloodlust on every unit within area

I have a building that I would like to have cast a bloodlust based spell on all friendly (player owned or ally, either one will work) units within range of 1200 of the building at 18:00 every night. I've tried some GUI things but they only will cast the ability on one unit. I set the ability to cooldown of 0 and mana cost 0. I think I need some JASS help for this one, and hopefully it will be simple.

It has to be a loop because it needs to have different buildings from different players do this all at once. I have variables for Temple[unitarray] and Number of Temples (integer). Here's what I need:

Loop for Temple[0] to Temple[Number of Temples-1]
Cast bloodlust on every friendly unit within 1200 of Temple[x] at 1800

Make sure your building has a 0.00 cast backswing and animation cast time. That's important. You can do this in GUI, too. If you need an example, I'd be glad to whip some GUI up.

Depending on what effects of the bloodlust you need, there might be an AoE spell that does the same thing; for movement speed bonus, the scroll of speed ability. For move and attack speed, I think silence can do those both. For unit size... well, you really need bloodlust for that. :)

have a event that detects when it's 18:00. Then give the tower the ability and make it use on everyone in range. You could set the cooldown and mana to 0. Then remove the ability.