Keeping track of time

[Trevor]

I'd like each enemy wave to appear after a certain amount of time has passed. I'd also like to be able to pause the game. However, the time between each wave is based on a getTime() value calculated when the level is loaded. If the game has been paused long enough by the time I resume and call getTime() again the value is so large multiple enemy waves are then drawn simultaneously. I call getTime() regularly as it is used to track the delay between player and enemy shots.

Here is the relevant code:
FirstLevel:

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function SecondLevel:load()
    Level:load()
    SecondLevel.Waves = {
        Formations:ByOnes(Raider, 0, 4),
        Formations:ByOnes(Raider, 128, 4),
        Formations:ByOnes(Raider, 288, 4)
    }
    -- getTime() determined when level loads. Pausing breaks this.
    SecondLevel.WaveTimes = {lt.getTime() + 3, lt.getTime() + 6, lt.getTime() + 9}
end

Utils:

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function Utils:togglePause()
    timeElapsed = love.timer.getTime()
    paused = not paused
end

Level:

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function Level:update(dt, te, w, wt)

    if not paused then
    
    -- Move enemy ships
    for i, v in ipairs(w) do
        if te > wt[i] then
            Manager:update(dt, v)
        end
    end
    ...

ActionSprite:

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function ActionSprite:shoot(dt, te)
    if (te - self.lastFired >= self.Weapon.rateOfFire) --[[and self.alive]] then
        -- Switch + / - for enemy / player repectively
        if self.isEnemy then
            table.insert(EnemyWeaponManager, self.Weapon:new{
            x = self.x, y = self.y + self.Weapon.image:getHeight() })
        elseif self.name == "P1" then
            table.insert(P1WeaponManager, self.Weapon:new{
            x = self.x, y = self.y - self.Weapon.image:getHeight() })
        elseif self.name == "P2" then
            table.insert(P2WeaponManager, self.Weapon:new{
            x = self.x, y = self.y - self.Weapon.image:getHeight() })
        end
        self.lastFired = love.timer.getTime()
    end
end

The full source code is here:
http://www.trevorhrenko.ca/jelaga/Jelaga.love

Thank you.

[Trevor]

Consider this one solved. I started tracking the amount of time spent paused then added that value to the time until the next wave to compensate.