Time and Stopwatch Object

This Object implements a Date and Time formatting methods and a stopwatch function.
TimeObj.js listing follows:

//The constructor for TimeObj
function TimeObj(){
  this.Month=1;
  this.Day=1;
  this.Year=0;
  this.Hour=0;
  this.Minute=0;
  this.Second=0;
  this.t=0;
  this.t1=0;
  this.t2=0;
  this.et=0;
}//end TimeObj

//Methods for TimeObj

TimeObj.prototype.updateTime=function(){­
   //setup date and time
    this.t = new Date();
    this.Month=this.t.getMonth();
    this.Day=this.t.getDate();
    this.Year=this.t.getFullYear();
    this.Hour =this.t.getHours(); 
    this.Minute=("0"+this.t.getMinutes()).su­bstr(-2);
    this.Second= ("0"+this.t.getSeconds()).substr(-2);
};//end updateTime

// a="M"; b="/"; c="D"; d="/"; e="Y";
TimeObj.prototype.getDate=function(a,b,c­,d,e){
var sss="";
  switch (a){
    case 'D': sss+=this.Day;break;
    case 'M': sss+=this.Month;break;
    case 'Y': sss+=this.Year;break;
    default: console.log("getDate Error");
  }//end switch a
  sss+=b;
  switch (c){
    case 'D': sss+=this.Day;break;
    case 'M': sss+=this.Month;break;
    case 'Y': sss+=this.Year;break;
    default: console.log("getDate Error");
  }//end switch c
  sss+=d;
  switch (e){
    case 'D': sss+=this.Day;break;
    case 'M': sss+=this.Month;break;
    case 'Y': sss+=this.Year;break;
    default: console.log("getDate Error");
  }//end switch e
  return sss;
};//end getDate

// a="H"; b="/"; c="M"; d="/"; e="S"
TimeObj.prototype.getTime=function(a,b,c­,d,e){
var sss="";
  switch (a){
    case 'H': sss+=this.Hour;break;
    case 'M': sss+=this.Minute;break;
    case 'S': sss+=this.Second;break;
    default: console.log("getTime Error");
  }//end switch a
  sss+=b;
  switch (c){
    case 'H': sss+=this.Hour;break;
    case 'M': sss+=this.Minute;break;
    case 'S': sss+=this.Second;break;
    default: console.log("getTime Error");
  }//end switch c
  sss+=d;
  switch (e){
    case 'H': sss+=this.Hour;break;
    case 'M': sss+=this.Minute;break;
    case 'S': sss+=this.Second;break;
    default: console.log("getTime Error");
  }//end switch e
  return sss;
};//end gettTime

// Stopwatch functions
TimeObj.prototype.SWstart=function(){
  this.updateTime();
  this.t1=this.t;
};//end SWstart

TimeObj.prototype.SWstop=function(){
  this.updateTime();
  this.t2=this.t;
  this.et=this.t2-this.t1;
  return this.et;
};//end SWstop

//end Methods for TimeObj

//Code to test TimeObj
function Testit(){
 var T= new TimeObj();
 T.updateTime();
 T.SWstart();
var aa=[['D','/','M','/','Y'],['M','/','D','­/','Y'],['Y','/','M','/','D']];
 console.log(T.getDate.apply(T,aa[0]));
 console.log(T.getDate.apply(T,aa[1]));
 console.log(T.getDate.apply(T,aa[2]));

var bb=[['H','/','M','/','S'],['H',':','M','­:','S'],['M','/','S',':','H']];
 console.log(T.getTime.apply(T,bb[0]));
 console.log(T.getTime.apply(T,bb[1]));
 console.log(T.getTime.apply(T,bb[2]));


 console.log(T.SWstop().toFixed(2));
}//end Testit

Testit();

The output of the Testit()function as seen in the left pane of the WebIDE:

>echo(0);
5/4/2016
4/5/2016
2016/4/5
6/59/36
6:59:36
59/36:6
14.58
=undefined
>

One question is about the elapsed time units. The value 14.58 seems a bit long for seconds. Perhaps it is milliseconds.

1 Attachment

• TimeObj.js

I think if you look at new Date you actually get an object. If you then do maths with that object, Date.valueOf gets called, which returns a time in milliseconds since 1970...

>new Date()
={ "ms": 949363214047.21643066406 }
>0+(new Date())                                                                 
=949363248128.48754882812  

So yes, the time returned by SWstop will be milliseconds.

Hope that helps :)

@gordon, I've been using the date constructor and splitting on spaces to format the hh:mm:ss part for a count down timer, and have discovered that if the the time is negative, you end up with a - sign instead of a leading 0.

I supply sample code if this makes it more clear....

>(new Date(-1000)).toString()                                                   
="Thu Jan 1 1970 00:00:-1 GMT+0000" 

I've just filed a bug for this

What would the correct output be in this case? What does node do?

-00:00:01 ?

The output at the moment can put a - in the h, m or s leading slot

Let's discuss it in the bug rather than messing up @ClearMemory041063's thread :)

http://forum.espruino.com/conversations/­286424/#comment12967777
Attached is an upgraded module timeobj.js and a project file testTimeObj.js.

You're correct that new.Date is an object, so the duplications in the object has been removed.
I found one bug in my code in that months are numbered 0 to 11.
The format uses arrays. The 'm' produces the three letter month name.

I tried using local modules today in a project directory, great so far.

Thanks for the comments and tips.

2 Attachments

• testTimeObj.js
• TimeObj.js