function isLeapYear(year:number) : boolean
{
    if ((year % 4) == 0) {
        if ((year % 100) == 0) {
            return true;
        } else {
            if ((year % 400) == 0) {
                return true;
            } else {
                return false;
            }
        }
    } else {
        return false;
    }
}


function getCurrentDaySecond(in_game_seconds:number) : number
{
    // each game cycle is 1 second of time:
    return (in_game_seconds + start_day_second)%(24*60*60);
}


function getCurrentDayMinute(in_game_seconds:number) : number
{
    // each game cycle is 1 second of time:
    return Math.floor(((in_game_seconds + start_day_second)%(24*60*60))/60);
}


function getCurrentDayHour(in_game_seconds:number) : number
{
    // each game cycle is 1 second of time:
    return Math.floor(((in_game_seconds + start_day_second)%(24*60*60))/(60*60));
}


function getCurrentYearDay(in_game_seconds:number) : number
{
    let days:number = Math.floor(in_game_seconds/(24*60*60)) + start_year_day;
    let year:number = start_year;
    let days_in_year:number = 365;
    if (isLeapYear(year)) days_in_year = 366;
    while(days >= days_in_year) {
        year++;
        days -= days_in_year;
        days_in_year = 365;
        if (isLeapYear(year)) days_in_year = 366;
    }

    return days;
}


function getCurrentYear(in_game_seconds:number) : number
{
    let days:number = Math.floor(in_game_seconds/(24*60*60)) + start_year_day;
    let year:number = start_year;
    let days_in_year:number = 365;
    if (isLeapYear(year)) days_in_year = 366;
    while(days >= days_in_year) {
        year++;
        days -= days_in_year;
        days_in_year = 365;
        if (isLeapYear(year)) days_in_year = 366;
    }

    return year;
}


function getCurrentDayOfTheMonth(in_game_seconds:number) : number
{
    let day:number = getCurrentYearDay(in_game_seconds);
    let year:number = getCurrentYear(in_game_seconds);
    let monthDays:number[] = [31,28,31,30,31,30,
                              31,31,30,31,30,31];
    if (isLeapYear(year)) monthDays[1] = 29;
    let month:number = 0;
    while(day>=monthDays[month]) {
        day -= monthDays[month];
        month++;
    }
    return day;
}


function getCurrentMonth(in_game_seconds:number) : number
{
    let day:number = getCurrentYearDay(in_game_seconds);
    let year:number = getCurrentYear(in_game_seconds);
    let monthDays:number[] = [31,28,31,30,31,30,
                              31,31,30,31,30,31];
    if (isLeapYear(year)) monthDays[1] = 29;
    let month:number = 0;
    while(day>=monthDays[month]) {
        day -= monthDays[month];
        month++;
    }
    return month;
}


function getCurrentDayOfTheWeek(in_game_seconds:number) : number
{
    let day:number = Math.floor(in_game_seconds/(24*60*60)) + start_day_of_the_week;
    return day%7;
}


function getCurrentDateString(in_game_seconds:number) : string
{
    let months:string[] = ["January", "February", "March", "April", 
                           "May", "June", "July", "August", 
                           "September", "October", "November", "December"];
    let days:string[] = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"];
    let d:string = days[getCurrentDayOfTheWeek(in_game_seconds)] + ", " + 
                   (getCurrentDayOfTheMonth(in_game_seconds)+1) + " of " + 
                   months[getCurrentMonth(in_game_seconds)] + " of " + getCurrentYear(in_game_seconds);
   return d;
}


function getCurrentTimeString(in_game_seconds:number) : string
{
    let t:string = getCurrentDayHour(in_game_seconds) + ":" + (getCurrentDayMinute(in_game_seconds)%60) + ":" + (getCurrentDaySecond(in_game_seconds)%60);
    return t;
}

/*
var start_year:number = 2432;
var start_year_day:number = 293;          // october 21st
var start_day_second:number = 8*60*60;    // 8am
var start_day_of_the_week:number = 3;     // october 21st, 2432 is a Thursday
*/

var start_year:number = 1000;            // not all the way to 0 so that the time values are not too large (scared we would get out of integer range)
var start_year_day:number = 0;          // october 21st
var start_day_second:number = 8*60*60;    // 8am
var start_day_of_the_week:number = 0;     // Jan 1st, 1000 is a Monday