مبدل تاریخ میلادی به شمسی:

[TAHA]

import java.util.Date;
import java.util.GregorianCalendar;
import  java.util.Calendar;
/**
* This class contains some static methods for  converting gregorian dates to
* persian date
* @author Nasser Sadeqi  (nasser_sadeqi@yahoo.com)
*/

public class PersianCal{
private  static double len = 365.24219879;
private static double base =  2346;

private static double greg_len = 365.2425;
private static double  greg_origin_from_jalali_base = 629964;
private static String  greg_month_names[]={"","Jan","Feb","Mar","Apr","May","June","Jul","A  ug","Sep","Oct","Nov","Dec"};

//-------------------------------------------------------------------
/**  Converts specified gregorian date to persian date in form of (yyyy/mm/dd)  */
public static String getPersianDate(int gregYear,int gregMonth,int  gregDay){
// passed days from Greg orig
double d =  Math.ceil((gregYear-1)*greg_len);
// passed days from jalali base
double  d_j = d + greg_origin_from_jalali_base +  getGregDayOfYear(gregYear,gregMonth,gregDay);

//first result! jalali  year
double j_y = Math.ceil(d_j/len)-2346;
// day of the year
double  j_days_of_year = Math.floor(((d_j/len) -  Math.floor(d_j/len))*365)+1;


System.out.println(j_days_of_year);
StringBuffer  result = new  StringBuffer();

result.append((int)j_y+"/"+(int)month(j_days_of_year)+"/"+(int)dayOfMonth(j_days_of_year));
return  result.toString();
}

/** Converts specified gregorian date to persian  date in form of (yyyy/mm/dd) */
public static String getPersianDate(Date  d){
GregorianCalendar gc = new GregorianCalendar();
gc.setTime(d);
int  year = gc.get(Calendar.YEAR);
return  getPersianDate(year,(gc.get(Calendar.MONTH))+1,gc.  get(Calendar.DAY_OF_MONTH));
}

/** Returns persian year according to  specified gregorian date. */
public static int getPersianYear(Date  dt){
GregorianCalendar gc = new  GregorianCalendar();
gc.setTime(dt);
int gregYear =  gc.get(Calendar.YEAR);
int gregMonth = gc.get(Calendar.MONTH)+1;
int  gregDay = gc.get(Calendar.DAY_OF_MONTH);

double d =  Math.ceil((gregYear-1)*greg_len);
double d_j = d +  greg_origin_from_jalali_base +  getGregDayOfYear(gregYear,gregMonth,gregDay);
double j_y =  Math.ceil(d_j/len)-2346;
double j_days_of_year = Math.floor(((d_j/len) -  Math.floor(d_j/len))*365);
return (int)j_y;
}

/** returns the  persian month number according to specified gregorian date (Months:1..12)  */
public static int getPersianMonth(Date dt){
GregorianCalendar gc = new  GregorianCalendar();
gc.setTime(dt);
int gregYear =  gc.get(Calendar.YEAR);
int gregMonth = gc.get(Calendar.MONTH)+1;
int  gregDay = gc.get(Calendar.DAY_OF_MONTH);

double d =  Math.ceil((gregYear-1)*greg_len);
double d_j = d +  greg_origin_from_jalali_base +  getGregDayOfYear(gregYear,gregMonth,gregDay);
double j_y =  Math.ceil(d_j/len)-2346;
double j_days_of_year = Math.floor(((d_j/len) -  Math.floor(d_j/len))*365);
return (int)month(j_days_of_year);
}

/**  Returns day number (1..31) */
public static int getPersianDayOfMonth(Date  dt){
GregorianCalendar gc = new  GregorianCalendar();
gc.setTime(dt);
int gregYear =  gc.get(Calendar.YEAR);
int gregMonth = gc.get(Calendar.MONTH)+1;
int  gregDay = gc.get(Calendar.DAY_OF_MONTH);

double d =  Math.ceil((gregYear-1)*greg_len);
double d_j = d +  greg_origin_from_jalali_base +  getGregDayOfYear(gregYear,gregMonth,gregDay);
double j_y =  Math.ceil(d_j/len)-2346;
double j_days_of_year = Math.floor(((d_j/len) -  Math.floor(d_j/len))*365);
return  (int)dayOfMonth(j_days_of_year);
}


//******************************
private  static double month(double day){

if(day<=6*31)
return  Math.ceil(day/31);
else
return  Math.ceil((day-6*31)/30)+6;
}

private static double dayOfMonth(double  day){

double m = month(day);
if(m<=6)
return day -  31*(m-1);
else
return day-(6*31)-(m-7)*30;
}

private static  double getGregDayOfYear(double year,double month,double day){
int  greg_moneths_len[] = {0,31,28,31, 30,31,30, 31,31,30 ,31,30,31};
boolean  leap=false;
if(((year%4)==0)&&(((year%400)!=0)))leap =  true;
if(leap)greg_moneths_len[2]=29;
int sum=0;
for(int  i=0;i<month;i++)
sum+=greg_moneths_len[i];
return  sum+day-2;
}

//**********
}