An English to Corresponding Bengali Calendar Date Converter

• Download source code - 4.9 KB

Introduction

I am surprised by the lack of Language and Date related support in Bangla Language in the web community.

I had a hard time finding a single library which does a single thing and that is - convert an English Date to a corresponding Bangla Calender Date.

Background

We are working on a very exciting project called ponjika (soon to be available on http://ponjika.social) where we have a lot of information related to Bengali Life and Culture and other aspects of life.

It needed a bangla date picker to know about what happened on that day in the history of Bengal. After selecting an English date shown in Bengali words, letters and digits from a date picker, we had to show the actual corresponding Bengali Calender Date in a text field (beside the English date in Bangla wordings).

So I looked up some resources in the web and patched up a solution.

Currently what it can do is convert an English Date of the form Year, Month, Day to Corresponding Bengali Calender date. (ex. 2017,05,08 to ১৪২৪,১,২৫).

The JavaScript Code

Pardon, it's quite BIG !!

var finalEnlishToBanglaNumber=
{'0':'০','1':'১','2':'২','3':'৩','4':'৪','5':'৫','6':'৬','7':'৭','8':'৮','9':'৯'};
  
var getDigitBanglaFromEnglish = function(str) {
    var retStr = str;
    for (var x in finalEnlishToBanglaNumber) {
         retStr = retStr.replace(new RegExp(x, 'g'), finalEnlishToBanglaNumber[x]);
    }
    return retStr;
};

//Bangla calendar added to "Basic Calendar Java Script" -By Brian Gosselin @ http://scriptasylum.com
//and Bangla calendar created by Uttam Singha @ http://www.usingha.com
var mn = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 
          'August', 'September', 'October', 'November', 'December'];
function buildCal(m, y, cM, cH, cDW, cD, brdr){
var bnum=['১']
var dim=[31,0,31,30,31,30,31,31,30,31,30,31];

var oD = new Date(y, m-1, 1); //DD replaced line to fix date bug when current day is 31st
oD.setTime(oD.getTime() + (oD.getTimezoneOffset() + 360) * 60 * 1000); 
    var bcal = Bangla_Date(y, m, 25);
    var bcal1 = Bangla_Date(y, m, 10);
oD.od=oD.getDay()+1; //DD replaced line to fix date bug when current day is 31st
var byy = (m == 4) ? convert((bcal[0]-1)) + '  ' + convert(bcal[0]) : convert(bcal[0]);
var todaydate = new Date() //DD added
todaydate.setTime(todaydate.getTime() + (todaydate.getTimezoneOffset() + 360) * 60 * 1000); 
var scanfortoday=(y==todaydate.getFullYear() && 
m==todaydate.getMonth()+1)? todaydate.getDate() : 0 //DD added

dim[1]=(((oD.getFullYear()%100!=0)&&(oD.getFullYear()%4==0))||(oD.getFullYear()%400==0))?29:28;
var t='<div class="'+cM+'"><table class="'+cM+'" cols="7" 
cellpadding="0" border="'+brdr+'" cellspacing="0"><tr align="center"><td colspan="2">'+
beng_bc_month_name[bcal1[1]]+'</td><td colspan="3">'+ byy + '</td><td colspan="2">' + 
beng_bc_month_name[bcal[1]] + '</td><tr align="center">';
t+='<td colspan="7" align="center" class="'+cH+'">'+mn[m-1]+' - '+y+'</td></tr><tr align="center">';
t+='<tr align="center"><td>রবি</td>    <td>সোম</td><td>মঙ্গল</td><td>বুধ</td><td>বৃহঃ</td>
<td>শুক্র</td><td>শনি</td></tr><tr align="center">';
for(s=0;s<7;s++)t+='<td class="'+cDW+'">'+"SMTWTFS".substr(s,1)+'</td>';
t+='</tr><tr align="center">';
for(i=1;i<=42;i++){
var x=((i-oD.od>=0)&&(i-oD.od<dim[m-1]))? i-oD.od+1 : ' ';
    var indcal = Bangla_Date(y, m, i-oD.od+1);
    var indcal1 = indcal[2]==1? '<font size="3" color="#800000">' + convert(indcal[2]) + 
    '</font>' :  convert(indcal[2])
    var xj=((i-oD.od>=0)&&(i-oD.od<dim[m-1]))? indcal1 : ' ';
if (x==scanfortoday) //DD added
x='<span id="today">'+x+'</span>' //DD added
t+='<td class="'+cD+'">'+x+'<br><span id="bangla">' + xj + '</span></td>';
if(((i)%7==0)&&(i<36))t+='</tr><tr align="center">';
}
return t+='</tr></table></div>';
}
var beng_bc_month_name = new Array;
beng_bc_month_name[1]         = "বৈশাখ";
beng_bc_month_name[2]         = "জ্যৈষ্ঠ";
beng_bc_month_name[3]         = "আষাঢ়";
beng_bc_month_name[4]         = "শ্রাবণ";
beng_bc_month_name[5]         = "ভাদ্র";
beng_bc_month_name[6]         = "আশ্বিন";
beng_bc_month_name[7]         = "কার্তিক";
beng_bc_month_name[8]         = "অগ্রহায়ন";
beng_bc_month_name[9]         = "পৌষ";
beng_bc_month_name[10]         = "মাঘ";
beng_bc_month_name[11]         = "ফাল্গুন";
beng_bc_month_name[12] = "চৈত্র";

var bbc_month_len = "";


var Weekbc_days = new Array( "Sunday", "Monday", "Tuesday", "Wednesday",
                          "Thursday", "Friday", "Saturday");
var bWeekbc_days = new Array("রবি", "সোম", "মঙ্গল", "বুধ", "বৃহস্পতি", "শুক্র", "শনি", "রবি");
var bWeekbc_days1 = new Array("রবি", "সোম", "মঙ্গল", "বুধ", "বৃহ:", "শুক্র", "শনি", "রবি");


function convert(str) {
    var mystr =str.toString();
var outj;    // javascript escaped hex
var outj1;
var be = new Array();
be['1'] = "\u09E7";
be['2'] = "\u09E8";
be['3'] = "\u09E9";
be['4'] = "\u09EA";
be['5'] = "\u09EB";
be['6'] = "\u09EC";
be['7'] = "\u09ED";
be['8'] = "\u09EE";
be['9'] = "\u09EF";
be['0'] = "\u09E6";
be[' '] = '';
be['-'] = '-';
outj1="";
for(var i=0; i<mystr.length; i++)
{    
var ch = mystr.substr(i,1);
    outj  = be[ch];
    outj1+=outj;
}
return outj1;

}

var mas_len = [0, 30.92569444, 62.63289352, 94.00184028, 125.4761458, 156.4885417, 
186.9247338, 216.8066667, 246.3155787, 275.6427546, 305.0935301, 334.9103588, 365.2587564814815];

function ModernDate_to_Julianeday(eyear, ebc_month, eday) {
    var julian_eday;

    if (ebc_month < 3) {
        eyear = eyear - 1;
        ebc_month = ebc_month + 12;
    }

    julian_eday = Math.floor((365.25 * eyear)) + Math.floor(30.59 * (ebc_month - 2)) + eday + 1721086.5;
    if (eyear < 0) {
        julian_eday = julian_eday - 1;
        if (((eyear % 4) == 0) && (3 <= ebc_month)) {
            julian_eday = julian_eday + 1;
        }
    }
    if (2299160 < julian_eday) {
        julian_eday = julian_eday + Math.floor(eyear * 1.0 / 400) - Math.floor(eyear * 1.0 / 100) + 2;
    }

    return julian_eday;
}

function Bangla_Date(eyear, ebc_month, eday) {
var country = "India";

    var str = "";
    var startjd = 0.0;
    if (country = "India") {
        startjd = 1938094.4629; //India
    }
    else {
        startjd = 1938094.483733333;
    }
    var nJD = ModernDate_to_Julianeday(eyear, ebc_month, eday);
    if (nJD < startjd) {
        str = " Date is not appropriate.\n";
    }
    else {
        var jddiff = nJD - startjd;
        var lasteyear = Math.floor(jddiff / 365.2587564814815);
        var mesh = startjd + lasteyear * 365.2587564814815;
        var lasteday = 0.0;
        var ps, ns, bebc_month, beday;
        for (var i = 0; i < 12; i++) {
            ps = mesh + mas_len[i];
            ns = mesh + mas_len[i + 1];
            if ((nJD >= ps) && (nJD <= Math.floor(ns) + 1.75)) {
                bebc_month = i + 1;
                beday = Math.floor(nJD - ps) + 1;
                //bbc_month_len =Math.floor(ns) + 0.5;
            }

        }
        var array = [];
          for (var i = 0; i < 12; i++)
                     {
                         lastday = mesh + mas_len[i];
                         var nda = new Date(calData(lastday + 1).toDateString());
                         array.push((nda.getMonth()+1) + "/" + nda.getDate() + "/" + nda.getFullYear());
                     }
                     bbc_month_len = array.join(",");

        //var bar = Math.floor(nJD + 0.5) % 7 + 1;
        //str = convert(beday) + " " + beng_bc_month_name[bebc_month] + " " + 
        //convert(lasteyear + 1) + " বঙ্গাব্দ, " + Weekebc_days[bar] + "বার।";

    }
    //return str;
     return new Array(lasteyear + 1, bebc_month, beday);

}
function oneDay() {
    var now = new Date();
    now.setTime(now.getTime() + (now.getTimezoneOffset() + 360) * 60 * 1000); 
    var eday= now.getDate();
    var ebc_month = now.getMonth();
    var eyear = now.getFullYear();
    var bcal = Bangla_Date(eyear, ebc_month + 1, eday);
    var nJD = ModernDate_to_Julianeday(eyear, ebc_month + 1, eday);
    var bar = Math.floor(nJD + 0.5) % 7 + 1;
    var str = convert(bcal[2]) + " " + beng_bc_month_name[bcal[1]] + " " + 
              convert((bcal[0])) + " বঙ্গাব্দ, " + bWeekbc_days[bar] + "বার।";
    return str;
}
function formSubmit()
{
    var todaydate = new Date();
    todaydate.setTime(todaydate.getTime() + (todaydate.getTimezoneOffset() + 360) * 60 * 1000); 
var curyear=todaydate.getFullYear();
var myyear;
if ((document.bdcalendar.myear.value)<595) 
{ myyear =curyear;}
else 
{myyear=document.bdcalendar.myear.value;}
var bdcal="";
bdcal+='<table border="0" width="80%" id="table1" cellspacing="0" cellpadding="0">' ;
    bdcal+='<tr valign="top">' ;
        bdcal+='<td>' + buildCal(1, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(2, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(3, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
    bdcal+='</tr>' ;
    bdcal+='<tr valign="top">' ;
        bdcal+='<td>' + buildCal(4, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(5, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(6, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
    bdcal+='</tr>' ;
    bdcal+='<tr valign="top">' ;
        bdcal+='<td>' + buildCal(7, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(8, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(9, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
    bdcal+='</tr>' ;
    bdcal+='<tr valign="top">' ;
        bdcal+='<td>' + buildCal(10, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(11, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
        bdcal+='<td>' + buildCal(12, myyear, "bc_main", "bc_month", 
                        "bc_bc_daysofweek", "bc_days", 1) + '</td>' ;
    bdcal+='</tr>' ;
bdcal+='</table>' ;
document.all.vvv.innerHTML=bdcal;
}
//------------------------------------------------------------------------------------------
// Calendar day from Julian Day
//------------------------------------------------------------------------------------------
function calData(jd)
{
with(Math){
z1 = jd + 0.5;
z2 = floor(z1);
f = z1 - z2;
if(z2 < 2299161)a = z2;
else {
alf = floor((z2 - 1867216.25)/36524.25);
a = z2 + 1 + alf - floor(alf/4);
}
b = a + 1524;
c = floor((b - 122.1)/365.25);
d = floor(365.25*c);
e = floor((b - d)/30.6001);
bc_days = b - d - floor(30.6001*e) + f;
kday = floor(bc_days);
if(e < 13.5)kmon = e - 1;
else kmon = e - 13;
if(kmon > 2.5)kyear = c - 4716;
if(kmon < 2.5)kyear = c - 4715;
hh1 = (bc_days - kday)*24;
khr = floor(hh1);
kmin = hh1 - khr;
ksek = kmin*60;
kmin = floor(ksek);
ksek = floor((ksek - kmin)*60);
if (kday < 10)kday = " " + kday;
if (khr < 10)khr = "0" + khr;
if (kmin < 10)kmin = "0" + kmin;
if (ksek < 10)ksek = "0" + ksek;
var dstr = mn[kmon - 1] + " " + kday + ", " + kyear + " " + khr + ":" + kmin + ":00";
//var sDate = new Date(Date.parse("03/20/2012", "MM/dd/yyyy"));
s = new Date(dstr);

}
return s;
}

function BanglaMas() {
    var dynTable = "";
    var now = new Date();
    now.setTime(now.getTime() + (now.getTimezoneOffset() + 360) * 60 * 1000); 
    var day = now.getDate();
    var bc_month = now.getMonth();
    var year = now.getFullYear();
    var bcal = Bangla_Date(year, bc_month + 1, day);
    var mesh = 1938094.4629 + (bcal[0] - 1) * 365.2587564814815;
    var bar = calData(mesh + mas_len[bcal[1] - 1] + 1);
    var startingDay = bar.getDay();
    var one_day = 1000 * 60 * 60 * 24;
    var mr = bbc_month_len.split(",");
    var diff = Math.ceil((new Date(mr[bcal[1]]) - new Date(mr[bcal[1] - 1])) / (one_day));

    var bc_monthLength = diff;
    //bcal[2]
   var html = '<table class="gridtable">';
   html += '<tr><th colspan="7">';
   html += beng_bc_month_name[bcal[1]] + "&nbsp;" + convert((bcal[0])) + " বঙ্গাব্দ";
   html += '</th></tr>';
   html += '<tr>';
   for (var i = 0; i <= 6; i++) {
       html += '<td style=\"color: red; background: #99ff66; border: 1px solid black; 
               font: 12px Siyam Rupali;\">';
       html += bWeekbc_days1[i];
       html += '</td>';
   }
   html += '</tr><tr>';
   var day = 1;
  // this loop is for is weeks (rows)
  for (var i = 0; i < 9; i++) {
    // this loop is for weekbc_days (cells)
    for (var j = 0; j <= 6; j++) { 
      html += '<td>';
      if (day <= bc_monthLength && (i > 0 || j >= startingDay)) {
          if (day == bcal[2]) //DD added
          {
              html += 'আজ<br><font size="3" color="red">' + convert(day) + '</font><br>'; //DD added
          }
          else {
              html += convert(day) + '<br>';
          }
      day++;
  }
  html += '</td>';
}
// stop making rows if we've run out of bc_days
if (day > bc_monthLength) {
    break;
} else {
    html += '</tr><tr>';
}
}
html += '</tr></table>';
return html;
}

//var date = new Date(Date.UTC(2017, 05, 08, 3, 0, 0));

// formats below assume the local time zone of the locale;
// America/Los_Angeles for the US

// US English uses month-day-year order
//console.log(date.toLocaleDateString('bn'));

function convertToBanglaDate(year, month, day){
    var english_number= "" + Bangla_Date(year, month, day + 1); // 1 is added for bangladeshi calender 

    var bangla_converted_number = getDigitBanglaFromEnglish(english_number);

    return bangla_converted_number;
}

* The JavaScript file (the one you will find in the attachment above) must be saved in Unicode format to support the hardcoded Bangla Digits.

Using the Code

However using it is very simple:

// invoke convertToBanglaDate with year, month and day parameter 
var banglaDate = convertToBanglaDate(2017, 5, 8);
document.getElementById("prnt").innerHTML = banglaDate;
//

Acknowledgements

1. https://github.com/wp-plugins/bangla-date-display
2. https://gist.github.com/codebazz/275d7e03b149f2a42ed2878cf57edf35
   A very witty piece of code written by Md. Shariful Islam :) [http://stackoverflow.com/users/1540689/md-shariful-islam]
    

History

• Article first uploaded : ১৪২৪,১,২৫ (i.e., Birthday of Tagore :) )