Help with effect conditions

[missaka]

Hi guys, i'm needing help on the condition for a "increaseSkillSneak" effect.

Here's the deal: the armor must give +5 sneak bonus when the player is in exterior (IsInInterior != 1) or in interior during the daytime (6h - 19h).

exterior && daytime = +5 sneak

exterior && nighttime = +5 sneak

interior && daytime = +5 sneak

interior && nighttime = no sneak bonus.

How can i do that?

I've tried this in the "conditions" but doesn't work:

IsInInterior != 1 OR

IsInInterior == 1 AND

getcurrenttime >= 6 AND

getcurrenttime <= 19 AND

I was thinking about another way: putting a +15 sneak bonus in the armor and create a penalty effect of - 5 sneak bonus when the the player is in interior and during the nighttime, but i can't find a effect that reduces the sneak skill.