SetTimer( "PayDayTimer", 100, true );

forward PayDayTimer();
public PayDayTimer()
{
    new
        hour,
        minute,
        second;
    gettime( hour, minute, second ); //get the current time
    if( minute == 0 ) //if minute == 0 - anything o' clock
    {
        for( new i = 0; i < MAX_PLAYERS; i++ ) //loop through all possible players
        {
            if( IsPlayerConnected( i )) //check if the players loop through are connected (no point giving money to players who don't exist)
            {
                SendClientMessage( i, 0xFFFF00FF, "PAYDAY! + $1000"); //send a message
                GivePlayerMoney( i, 1000 ); //give them money
            }
        }
    }
}