date string

@fvnnmikeApr 13.2005

i am developing a function that accept a date as a date string and return the date as a string of the last day of the previous month.

does someonhe has any idea?
tha ?

to post a comment

JavaScript

@CharlesApr 13.2005 — #

&lt;script type="text/javascript"&gt;
 &lt;!--
 Date.prototype.getFirstDayOfPreviousMonth = function () {return new Date (this.getFullYear (), this.getMonth () - 1, 1)}
 
 date = new Date ('13 April 2005');
 then = date.getFirstDayOfPreviousMonth();
 alert (then.toDateString());
 // --&gt;
 &lt;/script&gt;

@Warren86Apr 13.2005 — #"European" format:

<HTML>

<Head>

<Script Language=JavaScript>

function calcDate(isField){
 
   isValid = true;
   splitDate = isField.value.split("/");
   refDate = new Date(splitDate[1]+"/"+splitDate[0]+"/"+splitDate[2]);
   if (splitDate[1] < 1 || splitDate[1] > 12 || refDate.getDate() != splitDate[0] || splitDate[2].length != 4 || (!/^19|20/.test(splitDate[2])))
   {
   alert('Invalid date');
   isField.value = ""; 
   isField.focus(); 
   isValid = false;
   }
   if (isValid)
   {
   dateStr = new Date(Date.parse(refDate)-refDate.getDate()*86400000);
   slashStr = dateStr.getDate()+"/"+(dateStr.getMonth()+1)+"/"+dateStr.getFullYear();
   document.forms.Form1.backDate.value = slashStr;
   }
  }

</Script>

</Head>

<Body>

<Form name='Form1'>

Some Date: (dd/mm/yyyy) <input type=text size=9 name='inDate' onblur="calcDate(this)"><br>

Computed Date: <input type=text size=8 name='backDate' readonly>

</Form>

</Body>

</HTML>

"American" format:

<HTML>

<Head>

<Script Language=JavaScript>

function calcDate(isField){
 
   isValid = true;
   splitDate = isField.value.split("/");
   refDate = new Date(isField.value);
   if (splitDate[0] < 1 || splitDate[0] > 12 || refDate.getDate() != splitDate[1] || splitDate[2].length != 4 || (!/^19|20/.test(splitDate[2])))
   {
   alert('Invalid date');
   isField.value = ""; 
   isField.focus(); 
   isValid = false;
   }
   if (isValid)
   {
   dateStr = new Date(Date.parse(refDate)-refDate.getDate()*86400000);
   slashStr = dateStr.getMonth()+1+"/"+dateStr.getDate()+"/"+dateStr.getFullYear();
   document.forms.Form1.backDate.value = slashStr;
   }
  }

</Script>

</Head>

<Body>

<Form name='Form1'>

Some Date: (mm/dd/yyyy) <input type=text size=9 name='inDate' onblur="calcDate(this)"><br>

Computed Date: <input type=text size=8 name='backDate' readonly>

</Form>

</Body>

</HTML>

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@JuuitchanApr 13.2005 — #If you try to get the "zeroth" day of a month, JavaScript will give you the last day of the preceding month.

@JuuitchanApr 13.2005 — #Try this example:

<i>
 </i>// JavaScript month numbering is crazy.
 // In JavaScript, month 6 = July.
 
 alert(new Date(2000,6,4)) // gives July 4, 2000
 
 alert(new Date(2000,6,0)) // gives June 30, 2000

@CharlesApr 13.2005 — #If you try to get the "zeroth" day of a month, JavaScript will give you the last day of the preceding month.[/QUOTE]Which is how my example, above,works.

@JuuitchanApr 14.2005 — #That's not what I saw. Please re-examine your code, Charles.

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