October 16th, 2003, 08:32 PM
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Contributing User
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Join Date: Feb 2003
Location: Melbourne, Australia
Posts: 212
Time spent in forums: < 1 sec
Reputation Power: 6
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Well here it is  , others will probably scoff at the coding, but hey, it works.
PHP Code:
<script type="text/javascript">
function lastday()
{
/* This function updates the end date of a promotion based
* on the period entered for promotion length
*/
var runsfor,rExp;
var d, m, y;
// get the week commencing date and break into an array
commarr = document.forms["PromAdd1"].WeekComm.value.split("/");
// get the length of time the promotion runs
runsfor = document.forms["PromAdd1"].PromLength.value;
// get the d, m, y for the date from the array
d = new Number(commarr[0]);
m = new Number(commarr[1]) - 1; // must take of one as months stored as 0-11
y = new Number(commarr[2]);
// if a two digit year was entered, turn it to 2000
if (y < 2000)
{
y = y + 2000;
}
// create a new date based on original entered data
comm = new Date(y,m,d,00,00,00);
var sloc, factor, ends;
// use a regular expression to search for white space
// string e.g. "2 weeks"
rexp = /s/;
sloc = runsfor.search(rexp);
// get the period length as a number
factor = new Number(runsfor.slice(0,sloc));
//86400000 milliseconds in a day
// use a regular expression to determine weeks or months
rExp = /week/i;
var nend = new Date();
// check for weeks
if(runsfor.search(rExp)>-1)
{
// use the milliseconds since property, and add accordingly
ends = (comm.valueOf() - 86400000 + (factor * (86400000 * 7)));
nend.setTime(ends);
// set the end value on the form based on the calculation
document.forms["PromAdd1"].PromEnds.value = nend.getDate() + '/' + (nend.getMonth() + 1) + '/' + nend.getFullYear();
}
// check for the month.
rExp = /month/i;
if(runsfor.search(rExp)>-1)
{
ends = (comm.valueOf());
nend.setTime(ends);
nend.setMonth(nend.getMonth() + factor);
ends = (nend.valueOf() - 86400000);
nend.setTime(ends);
document.forms["PromAdd1"].PromEnds.value = nend.getDate() + '/' + (nend.getMonth() + 1) + '/' + nend.getFullYear();
}
}
</script>
Let me know if you have any queries.
HTH
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