/********************************************************************************/
/* solar.js - Solar Date Utility Functions                                      */
/* Copyright(C) 2002-2003 Mahmood Shafiee Zargar, all rights reserved.          */
/* sobh@softhome.net                                                            */
/* http://sobh.netfirms.com                                                     */
/**************************                                                     */
/* Persian Number String added by                                               */
/* Aidin Nasiri Shargh http://horm.org                                          */
/********************************************************************************/

var dkSolar = 0;
var dkGregorian = 1;

var DaysOfMonths = new Array();
var LeapMonth = new Array();
var DaysToMonth = new Array();

DaysOfMonths = [[31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29], [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]];
LeapMonth = [12, 2];
DaysToMonth = [[0, 31, 62, 93, 124, 155, 186, 216, 246, 276, 306, 336, 365], [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365]];

function Integer(val)
{
	this.value = val;
}

function IsLeapYear(DateKind, Year)
{
	if (DateKind == dkSolar) 
		return ((((Year + 38) * 31) % 128) <= 30);
	else
		return (((Year % 4) == 0) && (((Year % 100) != 0) || ((Year % 400) == 0)));
}

function DaysOfMonth(DateKind, Year, Month)
{
	var Result;
	if ((Year != 0) && ((Month <= 12) && (Month >= 1))) 
	{
		Result = DaysOfMonths[DateKind][Month - 1];
		if ((Month == LeapMonth[DateKind]) && IsLeapYear(DateKind, Year)) 
			Result++;
	}
	else
		Result = 0;
	return Result;
}

function IsDateValid(DateKind, Year, Month, Day)
{
	return ((Year!= 0) && (Month >= 1) && (Month <= 12) && (Day >= 1) && Day <= (DaysOfMonth(DateKind, Year, Month)));
}

function DaysToDate(DateKind, Year, Month, Day)
{
var Result;
	if (IsDateValid(DateKind, Year, Month, Day))
	{
		Result = DaysToMonth[DateKind][Month - 1] + Day;
		if ((Month > LeapMonth[DateKind]) && IsLeapYear(DateKind, Year)) 
			Result++;
	}
	else
		Result = 0;
	return Result;
}

function DateOfDay(DateKind, Days, Year, Month, Day)
{
var LeapDay = 0;
	Month.value = 0;
	Day.value = 0;
	for (var m = 2; m <= 13; m++) 
	{
		if ((m > LeapMonth[DateKind]) && (IsLeapYear(DateKind, Year))) LeapDay = 1;
			if (Days <= (DaysToMonth[DateKind][m - 1] + LeapDay))
			{
				Month.value = m - 1;
				if (Month.value <= LeapMonth[DateKind]) 
					LeapDay = 0;
				Day.value = Days - (DaysToMonth[DateKind][Month.value - 1] + LeapDay);
				break;
			}
	}
	return IsDateValid(DateKind, Year, Month.value, Day.value);
}

function GregorianToSolar(Year, Month, Day)
{
var LeapDay, Days, PrevGregorianLeap, Result;
	if (IsDateValid(dkGregorian, Year.value, Month.value, Day.value))
	{
		PrevGregorianLeap = IsLeapYear(dkGregorian, Year.value - 1);
		Days = DaysToDate(dkGregorian, Year.value, Month.value, Day.value);
		Year.value -= 622;
		if (IsLeapYear(dkSolar, Year.value)) 
			LeapDay = 1
		else 
			LeapDay = 0;
		if (PrevGregorianLeap && (LeapDay == 1)) 
			Days += 287
		else 
			Days += 286;
		if (Days > (365 + LeapDay))
		{
			Year.value++;
			Days -= (365 + LeapDay);
		}
		Result = DateOfDay(dkSolar, Days, Year.value, Month, Day);
	}
	else 
		Result = false;
	return Result;
}

function SolarToGregorian(Year, Month, Day)
{
var LeapDay, Days, PrevSolarLeap, Result;
	if (IsDateValid(dkSolar, Year.value, Month.value, Day.value))
	{
		PrevSolarLeap = IsLeapYear(dkSolar, Year.value - 1);
		Days = DaysToDate(dkSolar, Year.value, Month.value, Day.value);
		Year.value += 621;
		if (IsLeapYear(dkGregorian, Year.value)) 
			LeapDay = 1
		else 
			LeapDay = 0;
		if (PrevSolarLeap && (LeapDay = 1)) 
			Days += 80
		else 
			Days += 79;
		if (Days > (365 + LeapDay))
		{
			Year.value++;
			Days -= (365 + LeapDay);
		}
		Result = DateOfDay(dkGregorian, Days, Year.value, Month, Day);
	}
	else 
		Result = false;
	return Result;
}

var MonthNames = new Array();
var WeekDayNames = new Array();
var MonthDayNames = new Array();
var PersianDigits = new Array();
PersianDigits = ["&#1632", "&#1633", "&#1634", "&#1635", "&#1636", "&#1637", "&#1638", "&#1639", "&#1640", "&#1641"];
MonthNames = ["&#1601;&#1585;&#1608;&#1585;&#1583;&#1740;&#1606;", "&#1575;&#1585;&#1583;&#1740;&#1576;&#1607;&#1588;&#1578;", "&#1582;&#1585;&#1583;&#1575;&#1583;", "&#1578;&#1740;&#1585;", "&#1605;&#1585;&#1583;&#1575;&#1583;", "&#1588;&#1607;&#1585;&#1740;&#1608;&#1585;", "&#1605;&#1607;&#1585;", "&#1570;&#1576;&#1575;&#1606;", "&#1570;&#1584;&#1585;", "&#1583;&#1740;", "&#1576;&#1607;&#1605;&#1606;", "&#1575;&#1587;&#1601;&#1606;&#1583;"];
WeekDayNames = ["&#1740;&#1705;&#1588;&#1606;&#1576;&#1607;", "&#1583;&#1608;&#1588;&#1606;&#1576;&#1607;", "&#1587;&#1607; &#1588;&#1606;&#1576;&#1607;", "&#1670;&#1607;&#1575;&#1585; &#1588;&#1606;&#1576;&#1607;", "&#1662;&#1606;&#1580; &#1588;&#1606;&#1576;&#1607;", "&#1580;&#1605;&#1593;&#1607;", "&#1588;&#1606;&#1576;&#1607;"];
MonthDayNames = ["&#1575;&#1608;&#1604;", "&#1583;&#1608;&#1605;", "&#1587;&#1608;&#1605;", "&#1670;&#1607;&#1575;&#1585;&#1605;", "&#1662;&#1606;&#1580;&#1605;", "&#1588;&#1588;&#1605;", "&#1607;&#1601;&#1578;&#1605;", "&#1607;&#1588;&#1578;&#1605;", "&#1606;&#1607;&#1605;", "&#1583;&#1607;&#1605;", "&#1740;&#1575;&#1586;&#1583;&#1607;&#1605;", "&#1583;&#1608;&#1575;&#1586;&#1583;&#1607;&#1605;", "&#1587;&#1740;&#1586;&#1583;&#1607;&#1605;", "&#1670;&#1607;&#1575;&#1585;&#1583;&#1607;&#1605;", "&#1662;&#1575;&#1606;&#1586;&#1583;&#1607;&#1605;", "&#1588;&#1575;&#1606;&#1586;&#1583;&#1607;&#1605;", "&#1607;&#1601;&#1583;&#1607;&#1605;", "&#1607;&#1580;&#1583;&#1607;&#1605;", "&#1606;&#1608;&#1586;&#1583;&#1607;&#1605;", "&#1576;&#1740;&#1587;&#1578;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1740;&#1705;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1583;&#1608;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1587;&#1608;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1670;&#1607;&#1575;&#1585;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1662;&#1606;&#1580;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1588;&#1588;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1607;&#1601;&#1578;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1607;&#1588;&#1578;&#1605;", "&#1576;&#1740;&#1587;&#1578; &#1608; &#1606;&#1607;&#1605;", "&#1587;&#1740; &#1575;&#1605;", "&#1587;&#1740; &#1608; &#1740;&#1705;&#1605;"];

function PersianNumberString(num) {
	var ret = "";
	do {
		ret = PersianDigits[(num%10)] + ret;
		num = Math.floor(num/10);
	} while (num > 0);
	return ret;
}

function ConvertStr(DateStr)
{
var Result;
var ObjDate = new Date();
var SplDate = DateStr.split("/"); for (i=0; i<3; i++) if (SplDate[i].charAt(0) == '0') SplDate[i] = SplDate[i].substr(1);

var M = new Integer(parseInt(SplDate[0]));
var D = new Integer(parseInt(SplDate[1]));
var Y = new Integer(parseInt(SplDate[2]));
	ObjDate.setFullYear(Y.value);
	ObjDate.setMonth(M.value - 1);
	ObjDate.setDate(D.value);
	var W = ObjDate.getDay();
	if (GregorianToSolar(Y, M, D)) {
		FaYear = PersianNumberString(Y.value);
		return (MonthDayNames[D.value - 1] + " " + MonthNames[M.value - 1] + " &#1605;&#1575;&#1607; " + FaYear); 
	}
} 

function ConvertStrdigital(DateStr)
{
var Result;
var ObjDate = new Date();
var SplDate = DateStr.split("/"); 
var M = new Integer(parseInt(SplDate[0]));
var D = new Integer(parseInt(SplDate[1]));
var Y = new Integer(parseInt(SplDate[2]));
	ObjDate.setFullYear(Y.value);
	ObjDate.setMonth(M.value - 1);
	ObjDate.setDate(D.value);
	var W = ObjDate.getDay();
	if (GregorianToSolar(Y, M, D))
		return (Y.value + " / " + M.value + " / " + D.value); 
}