This script checks differences in times
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local timeDiff = function(t2,t1)
	local d1,d2,carry,diff = os.date('*t',t1),os.date('*t',t2),false,{}
	local colMax = {60,60,24,os.date('*t',os.time{year=d1.year,month=d1.month+1,day=0}).day,12}
	d2.hour = d2.hour - (d2.isdst and 1 or 0) + (d1.isdst and 1 or 0)
	for i,v in ipairs({'sec','min','hour','day','month','year'}) do
		diff[v] = d2[v] - d1[v] + (carry and -1 or 0)
		carry = diff[v] < 0
		if carry then diff[v] = diff[v] + colMax[i] end
	end
	return diff
end

local td=timeDiff(os.time(),os.time{year=zs.param(2),month=zs.param(3),day=zs.param(4),hour=zs.param(5),min=zs.param(6),sec=zs.param(7)})

local name = zs.param(1)
for i,v in pairs(td) do zs.cmd.addkey(name,i,v) end

This is the script i call when its quest time
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zs.getclass("q_trigs").enabled = 1
send("gt @C+@B=@C+(@CQ@Buest @CT@Bime@C)@C+@B=@C+")
image=math.random(1,23)
--zs.mxp("<image ./Images/questpic" .. image .. ".jpg>")
zs.cmd.play("Quest.mp3")