[__]

I've added a list of calculations now, so it should be a bit more clear, but for your predicament, if you had a command with the syntax of '/tempban [playerid] [years] [weeks] [days] [hours]' then you'd have to do something like this:

pawn Code:

CMD:tempban(playerid, params[]) {
    new
        iYears,
        iMonths,
        iFinalCalculation = gettime(),
        iHours,
        iWeeks,
        iTarget;


    if(sscanf(params, "udddddds", iTarget, iYears, iMonths, iWeeks, iDays, iHours, iMinutes, szReason))
        return SendClientMessage(playerid, COLOR, "Syntax: /tempban [playerid] [years] [months] [weeks] [days] [hours] [minutes] [reason]");


    iFinalCalculation = gettime() + mktime(iHours, iMinutes, 0, iDays, iMonths, iYears); // get mktime() from here: http://y-less.pastebin.ca/1000201
        
    // iFinalCalculation retains the final unix timestamp you'll set them to be banned for.
    // Check when a player connects to see if they have a timestamp, and if they do, check if it exceeds gettime()
    // ...if it does, then unban/remove ban
        
    return 1;
}