// ***********************************************************


// TIMEDATE.JS - JS Time/Date-Processing Library


// =============================================


// This library contains functions to process time and date


// values. It's yours for free; please maintain this header!


//


// To load this library in an HTML doc, put the following


// line in the doc's HEAD (before any other SCRIPT tags):


//


// <SCRIPT SRC="timedate.js" LANGUAGE="JavaScript"></SCRIPT>


//


// Author      Ver  Date    Comments


// ======      ===  ====    ========


// Rick Scott  1.0  1/1/00  First release


//


// Copyright 2000, Rick Scott, all rights reserved.


// ********************************************************* */





// ***********************************************************


// USAGE


// =====


// var myDate1 = new TimeDate()


//   creates a TimeDate object named myDate1, time/date = now


// var myDate2 = new TimeDate("dateString")


//   creates TimeDate obj named myDate2, date = dateString vals


//   dateString format: "Month day#, yyyyYear#"


//   for example: "January 1, 2000" 


// all TimeDate objects have the following properties:


//   objName.date - date (in default JS format)


//   objName.year - year (in yyyy format)


//   objName.monthNum - month number (1-12)


//   objName.zp_monthNum - zero-padded month num (01-09)


//   objName.monthName - month name ("January", etc.)


//   objName.dayNum - day number (1-31)


//   objName.dayNumSuffix - // day-num suffix (st, nd, rd, etc.)


//   objName.zp_dayNum - zero-padded day num (01-09)


//   objName.dayName - day name ("Sunday", etc.)


//   objName.hours - hour number (0-23)


//   objName.zp_hours - zero-padded hour num (00-09)


//   objName.ampmhours - am/pm hour number (1-12)


//   objName.ampm - am or pm?


//   objName.minutes - minute number (0-59)


//   objName.zp_minutes - zero-padded minute num (00-09)


//   objName.seconds - second number (0-59)


//   objName.zp_seconds - zero-padded second num (00-09)


//   objName.msecs - num milliseconds in date


//


// get_duration(startDate, endDate, timeUnits)


//   calcs duration in timeUnits between startDate and endDate


//   startDate - any valid TimeDate object


//   endDate - any valid TimeDate object


//   timeUnits - SECONDS, MINUTES, HOURS, DAYS, WEEKS, 


//     MONTHS, YEARS


// ********************************************************* */





// global duration constants


var MSECSINSECOND = 1000;


var MSECSINMINUTE = 1000 * 60;


var MSECSINHOUR   = 1000 * 60 * 60;


var MSECSINDAY    = 1000 * 60 * 60 * 24;


var MSECSINWEEK   = 1000 * 60 * 60 * 24 * (365.25/52);


var MSECSINMONTH  = 1000 * 60 * 60 * 24 * (365.25/12);


var MSECSINYEAR   = 1000 * 60 * 60 * 24 * 365.25;


var SECONDS       = "seconds";


var MINUTES       = "minutes"; 


var HOURS         = "hours";


var DAYS          = "days";


var WEEKS         = "weeks";


var MONTHS        = "months";


var YEARS         = "years";





// store month names in monthNames array


var MonthNames = new Array("January", "February", "March", "April", "May",


    "June", "July", "August", "September", "October", "November", "December");





// store day names in dayNames array


var DayNames = new Array("Sunday", "Monday", "Tuesday", "Wednesday", 


    "Thursday", "Friday", "Saturday");





function TimeDate(dateStr)  // TimeDate object constructor function


  {


  if (arguments.length > 1)   // new TimeDate(year, month, etc.) calls illegal!


    return;


  if (arguments.length == 0)  // handle call: new TimeDate()


    this.date = new Date();


  else                        // handle call: new TimeDate(dateStr)


    this.date = new Date(dateStr);


  this.year = get_year(this.date);               // year (in yyyy format)


  this.monthNum = this.date.getMonth() + 1;      // month number (1-12)


  this.zp_monthNum = zeropad(this.monthNum);     // zero-padded month num (01-09)


  this.monthName = MonthNames[this.monthNum-1];  // month name ("January", etc.)


  this.dayNum = this.date.getDate();             // day number (1-31)


  // day-num suffix (st, nd, rd, etc.) - to create strings: 1st, 2nd, 3rd, etc.


  this.dayNumSuffix = get_dayNumSuffix(this.dayNum);


  this.zp_dayNum = zeropad(this.dayNum);         // zero-padded day num (01-09)


  this.dayName = DayNames[this.date.getDay()];   // day name ("Sunday", etc.)


  this.hours = this.date.getHours();             // hour number (0-23)


  this.zp_hours = zeropad(this.hours);           // zero-padded hour num (00-09)


  this.ampmhours = get_ampmHours(this.hours);    // am/pm hour number (1-12)


  this.ampm = get_ampm(this.hours);              // am or pm?


  this.minutes = this.date.getMinutes();         // minute number (0-59)


  this.zp_minutes = zeropad(this.minutes);       // zero-padded minute num (00-09)


  this.seconds = this.date.getSeconds();         // second number (0-59)


  this.zp_seconds = zeropad(this.seconds);       // zero-padded second num (00-09)


  this.msecs = this.date.getTime();              // date in milliseconds


  }





// calculate the duration in timeUnits between startDate and endDate


// function get_duration(startDate, endDate, timeUnits)


//   {


//  var divisor;


//


//   duration = endDate.msecs - startDate.msecs;


//   if (timeUnits == YEARS)


//     divisor = MSECSINYEAR;


//   else if (timeUnits == MONTHS)


//     divisor = MSECSINMONTH;


//   else if (timeUnits == WEEKS)


//     divisor = MSECSINWEEK;


//   else if (timeUnits == DAYS)


//     divisor = MSECSINDAY;


//   else if (timeUnits == HOURS)


//     divisor = MSECSINHOUR;


//   else if (timeUnits == MINUTES)


//    divisor = MSECSINMINUTE;


//  else if (timeUnits == SECONDS)


//    divisor = MSECSINSECOND;


//


//  var returnVal = duration/divisor;


//  if (returnVal >= 0)


//    return Math.floor(duration/divisor);


//  else


//    return Math.ceil(duration/divisor);


//  }





function get_year(date)  // get year in  format (e.g., 2000, not 0 or 100)


  {


  var year = date.getYear();


  if (year < 1000)


    year += 1900;


  return year;


  }





function get_ampmHours(hournum) // convert hour num for am/pm


  {


  if (hournum == 0)   // 12 am


    return 12;


  if (hournum > 12)   // 1-12 (pm)


    return (hournum - 12);


  else                // 1-11 (am)


    return hournum;


  }





function get_ampm(hournum)  // return "am" or "pm" string


  {


  if (hournum < 12)


    return "am";


  else


    return "pm";


  }





function zeropad(num)  // zero-pad single-digit numbers (00...09)


  {


  if (num < 10)


    return ("0" + num);


  else


    return num;


  }





function get_dayNumSuffix(num)  // return day-num suffix (1st, 2nd, 3rd, ..., 31st)


  {


  if (num == 1 || num == 21 || num == 31)


    return "st";


  else if (num == 2 || num == 22)


    return "nd";


  else if (num == 3 || num == 23)


    return "rd";


  else


    return "th";


  }





//