what is the java script source code to find the serial number of a date of a year.
7  4574  gits 5,390
Recognized Expert Moderator Expert
may i ask what a 'serial number of a date of a year' is? never heard of it - could you give an example or link to it?
The serial number of 1900.01.01 is 1.
The serial number of 1901.01.01 is 365.
Serial number is the system assigned number for a date from the day 1900.01.01
gits 5,390
Recognized Expert Moderator Expert
in that case it is basically the day difference to the base date. a simple way could be to extend the JavaScript date object like this: - Date.prototype.getSerialDateNumber = function() {
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var baseDate = new Date(1900,1,1);
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// one day based on ms
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var oneDay = 86400000;
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var dayDiff = Math.ceil(
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(this.getTime() - baseDate.getTime()) / oneDay
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);
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return dayDiff;
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}
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var d = new Date;
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alert(d.getSerialDateNumber());
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<html><head><title>Day counter</title>
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<script language="javascript">
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Date.prototype.getSerialDateNumber = function() {
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var baseDate = new Date(1900,1,1);
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//this is the date that i want to find the serial number--------I add this
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var mydate=new Date(1900,1,31);
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// one day based on ms
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var oneDay = 86400000;
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-
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var dayDiff = Math.ceil(
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(mydate.getTime() - (baseDate.getTime()-oneDay)) / oneDay
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//"oneDay" should be abstracted from baseDate.getTime() to get the right answer isn't it...
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);
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-
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return dayDiff;
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}
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var d = new Date;
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alert(d.getSerialDateNumber());
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</script>
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</head>
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<body>
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</body>
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</html>
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Thank you very much sir, I understood your code and I have done some changes On it. Is it a good change or a bad one. Please reply. How ever thank you very much for your help.
gits 5,390
Recognized Expert Moderator Expert
it works for this case ... but you wouldn't have needed it ... in line 21 of your last code post the following would have done the job: - var d = new Date(1900,1,31);
your change fixes the output to a specific date and makes the date-extension nearly useless ... which could give you the serial date number for any date without your change - so ... you might judge your change for yourself ... what would you say? bad or good change? :)
gits 5,390
Recognized Expert Moderator Expert
ahh ... and we need a fix for the baseDate: - new Date(1900,1,1)
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// is: Thu Feb 01 1900 00:00:00 GMT+0100 (CET)
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// while:
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new Date(1900,0,1)
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// is: Mon Jan 01 1900 00:00:00 GMT+0100 (CET)
so the month starts at 0 for january ... just overlooked it before :) you might have a look here for a reference to the JavaScript Date object.
Thanks, Now your code is working properly. Please be in touch.
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