Here’s a few blocks of code samples that I like to reference when trying to deal with Dates in IBM BPM.
This first block (Date Difference Calculation Testing) helps you determine an integer number of dates between two TWDate variables.
// Date Difference Calculation Testing
// Date1 + xNumberOfDays = Today
// xNumberOfDays = Today - Date1
tw.local.aDate = new TWDate(); //SETUP SAMPLE
tw.local.aDate.parse("05/15/2005","MM/dd/yyyy"); //SETUP SAMPLE
if (tw.local.aDate && tw.local.aDate < new TWDate()) {
// Today...as in right now
var tday = new Date();
// convert to native Java Date
var aDay = tw.local.aDate.toNativeDate();
var one_day = 1000*60*60*24; // milliseconds in 1 day
var tm = tday.getTime(); // milliseconds for date1
var am = aDay.getTime(); // milliseconds for date2
var diff = tm - am; // milliseconds difference
tw.local.dateInt = diff; // this is actually a decimal
// convert milliseconds to days
var days = Math.round(Math.abs(diff/one_day));
// Integer of number of days between aDate and today
tw.local.dateIntTwo = days;
}
This is a cool way to tell if a date variable is within a specific threshold.Ā My use case was that the application stored when it made a specific integration call and then if we came back and needed that call again we’d check to see when it was last invoked.Ā This could easily be done with caching or something fancier but for this scenario a simple “was the last call too long ago?” bit of logic was all that we needed.
// Assume the service needs to be called again
tw.local.refreshNeeded = true;
// aDate is the value of the last time the service was called
if (tw.local.aDate) {
var lastCall = tw.local.aDate.toNativeDate();
var now = new Date();
// EPV to store threshold in seconds to consider time stamp stale
var threshold = Number(tw.epv.refreshThreshold);
var thresholdMS = threshold * 1000;
var lcMS = lastCall.getTime();
var nowMS = now.getTime();
var diff = (nowMS - lcMS);
if (diff <= thresholdMS) {
tw.local.refreshNeeded = false;
}
}
Thaxton's Nerd Notes 
Its pretty helpful… š
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