RetroZilla/mailnews/base/resources/content/dateFormat.js

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 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alec Flett <alecf@netscape.com>
 *   Seth Spitzer <sspitzer@netscape.com>
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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var gSearchDateFormat = 0;
var gSearchDateSeparator;

// Get the short date format option of the current locale.
// This supports the common case which the date separator is
// either '/', '-', '.' and using Christian year.
function getLocaleShortDateFormat()
{
  // default to mm/dd/yyyy
  gSearchDateFormat = 3;
  gSearchDateSeparator = "/";

  try {
    var dateFormatService = Components.classes["@mozilla.org/intl/scriptabledateformat;1"]
                                    .getService(Components.interfaces.nsIScriptableDateFormat);
    var dateString = dateFormatService.FormatDate("", 
                                                  dateFormatService.dateFormatShort, 
                                                  1999, 
                                                  12, 
                                                  31);

    // find out the separator
    var possibleSeparators = "/-.";
    var arrayOfStrings;
    for ( var i = 0; i < possibleSeparators.length; ++i )
    {
      arrayOfStrings = dateString.split( possibleSeparators[i] );
      if ( arrayOfStrings.length == 3 )
      {
        gSearchDateSeparator = possibleSeparators[i];
        break;
      }
    }

    // check the format option
    if ( arrayOfStrings.length != 3 )       // no successfull split
    {
      dump("getLocaleShortDateFormat: could not analyze the date format, defaulting to mm/dd/yyyy\n");
    }
    else
    {
      if ( arrayOfStrings[0] == "31" )
      {
        // 31.12.1999 or 31.1992.12
        gSearchDateFormat = arrayOfStrings[1] == "12" ? 5 : 6;
      }
      else if ( arrayOfStrings[1] == "31" )
      {
        // 12.31.1999 or 1999.31.12
        gSearchDateFormat = arrayOfStrings[0] == "12" ? 3 : 2;
      }
      else  // implies arrayOfStrings[2] == "31"
      {
        // 12.1999.31 or 1999.12.31
        gSearchDateFormat = arrayOfStrings[0] == "12" ? 4 : 1;
      }
    }
  }
  catch (e)
  {
    dump("getLocaleShortDateFormat: caught an exception!\n");
  }
}

function initializeSearchDateFormat()
{
  if (gSearchDateFormat)
    return;

  // get a search date format option and a seprator
  try {
    var pref = Components.classes["@mozilla.org/preferences-service;1"]
                                 .getService(Components.interfaces.nsIPrefBranch);
    gSearchDateFormat =
               pref.getComplexValue("mailnews.search_date_format", 
                                    Components.interfaces.nsIPrefLocalizedString);
    gSearchDateFormat = parseInt(gSearchDateFormat);

    // if the option is 0 then try to use the format of the current locale
    if (gSearchDateFormat == 0)
      getLocaleShortDateFormat();
    else
    {
      if (gSearchDateFormat < 1 || gSearchDateFormat > 6)
        gSearchDateFormat = 3;

      gSearchDateSeparator =
                 pref.getComplexValue("mailnews.search_date_separator", 
                                      Components.interfaces.nsIPrefLocalizedString);
    }
  } catch (ex) {
    // set to mm/dd/yyyy in case of error
    gSearchDateFormat = 3;
    gSearchDateSeparator = "/";
  }
}

function convertPRTimeToString(tm)
{
  var time = new Date();
  // PRTime is in microseconds, Javascript time is in milliseconds
  // so divide by 1000 when converting
  time.setTime(tm / 1000);
  
  return convertDateToString(time);
}

function convertDateToString(time)
{
  var year, month, date;
  initializeSearchDateFormat();

  year = 1900 + time.getYear();
  month = time.getMonth() + 1;  // since js month is 0-11
  date = time.getDate();

  var dateStr;
  var sep = gSearchDateSeparator;

  switch (gSearchDateFormat)
  {
    case 1:
      dateStr = year + sep + month + sep + date;
      break;
    case 2:
      dateStr = year + sep + date + sep + month;
      break;
    case 3:
     dateStr = month + sep + date + sep + year;
      break;
    case 4:
      dateStr = month + sep + year + sep + date;
      break;
    case 5:
      dateStr = date + sep + month + sep + year;
      break;
    case 6:
      dateStr = date + sep + year + sep + month;
      break;
    default:
      dump("valid search date format option is 1-6\n");
  }

  return dateStr;
}

function convertStringToPRTime(str)
{
  initializeSearchDateFormat();

  var arrayOfStrings = str.split(gSearchDateSeparator);
  var year, month, date;

  // set year, month, date based on the format option
  switch (gSearchDateFormat)
  {
    case 1:
      year = arrayOfStrings[0];
      month = arrayOfStrings[1];
      date = arrayOfStrings[2];
      break;
    case 2:
      year = arrayOfStrings[0];
      month = arrayOfStrings[2];
      date = arrayOfStrings[1];
      break;
    case 3:
      year = arrayOfStrings[2];
      month = arrayOfStrings[0];
      date = arrayOfStrings[1];
      break;
    case 4:
      year = arrayOfStrings[1];
      month = arrayOfStrings[0];
      date = arrayOfStrings[2];
      break;
    case 5:
      year = arrayOfStrings[2];
      month = arrayOfStrings[1];
      date = arrayOfStrings[0];
      break;
    case 6:
      year = arrayOfStrings[1];
      month = arrayOfStrings[2];
      date = arrayOfStrings[0];
      break;
    default:
      dump("valid search date format option is 1-6\n");
  }

  month -= 1; // since js month is 0-11

  var time = new Date(year, month, date);

  // Javascript time is in milliseconds, PRTime is in microseconds
  // so multiply by 1000 when converting
  return (time.getTime() * 1000);
}