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Submitted on: 4/20/2001 3:00:26 PM
By: Cecil Denney
Level: Intermediate
User Rating:
By 5 Users
Compatibility:ASP (Active Server Pages)
Users have accessed this code 13304 times.
| (About the author) |
| | | 1) Validate a date entered in a text box without having to use multiple boxes for day, month, year.
2) Implement a short, mathematical method
3) Provide feedback about incorrect entries
| | | |
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'**************************************
' for :isDate()
'**************************************
Copyright 2001, The Jesse Tree | code:
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Terms of Agreement:
By using this code, you agree to the following terms...
1) You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.
3) You may link to this code from another website, but ONLY if it is not wrapped in a frame.
4) You will abide by any additional copyright restrictions which the author may have placed in the code or code's description.
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'**************************************
' Name: isDate()
' Description:1) Validate a date entered
' in a text box without having to use mult
' iple boxes for day, month, year.
2) Implement a short, mathematical method
3) Provide feedback about incorrect entries
' By: Cecil Denney
'
' Inputs:a date in numeric form, day/mon
' th/year, one or two digits for day and m
' onth. Assume 2 digit years are for 2000.
'
'
' Returns:Corrected, editted date or "ER
' ROR: " message.
'
' Assumes:Makes use of 400 year cycle ca
' lendar for leap years.
'
'This code is copyrighted and has ' limited warranties.Please see http://w
' ww.Planet-Source-Code.com/vb/scripts/Sho
' wCode.asp?txtCodeId=6605&lngWId=4 'for details. '**************************************
<%
'copyright 2001, The Jesse Tree
'This Web page illustrates the use of th
' e date functions
' Developed by Cecil Denney, Automation
' consultant to
' The Jesse Tree, 2622 Market Street, Ga
' lveston, TX 77550
option explicit
Dim i, Date1, Date2
%>
<HTML>
<HEAD>
<SCRIPT Language="JavaScript">
// The IsDate() a short, clean JavaScript function that uses the 400 year cycle
//calendar To validate a date.
// It accepts one or two digits For the day, month, or year. However, for the year,
//two digits are assumed To be 2000+
// CheckDate() uses isDate() To check the date and display the result or an Error message.
function isDate(theDate)
{
var dtval = theDate.split("/")
if (dtval.length != 3) {return "ERROR: Format is 'mm/dd/yyyy'" }
Else {
var mo = dtval[0]-1+1;
var day = dtval[1]-1+1;
var yr = dtval[2]-1+1;
yr = (yr < 100) ? yr + 2000 : yr;
if (yr > 9999){return "ERROR: Maximum year 9999."}
var days = 0
if (mo >= 13){ return "ERROR: Maximum 12 months." }
Else {
switch (mo)
{
Case 2:
// For February (implements 400 year cycle calculation)
days = (((yr%4 == 0 && yr%100 != 0) || yr%400 ==0) ? 29 : 28 );
break;
default:
// For January thru December except February
days = 30 + ((mo < 8) ? mo%2 : (mo%7)%2);
}
if (days < day){return "ERROR: Maximum of "+days+" For month "+mo+"."}
Else {return mo+"/"+day+"/"+yr}
//return dtval[0]-1+1
}
}
}
function CheckDate(){
var indate = document.all.Users.value;
indate = isDate(indate);
document.all.Calculated.value = indate;
}
</SCRIPT>
</HEAD>
<BODY>
Enter Date: <INPUT id="Users" type="text" name="TestDate" size="30" onblur="CheckDate()"><BR>
Calculated: <INPUT id="Calculated" type="text" name="Calculated" size="40">
</BODY>
</HTML>
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