DateJS.js and MS CRM

My customer had a wish of calculating estimated revenue based on hour per week, amount per hour and calculated based on business days between start date and the end data.
There was a tiny little detail that caused some thinking… which was that the end data is most cases start date + 3 months… so I needed to calculate the end data.


Problem #1 was the calculation of business days between two dates.
This wasn’t too hard, since Google found me an answer that looked like this:

Solution #1

function calcBusinessDays(dDate1, dDate2) { // input given as Date objects

var iWeeks, iDateDiff, iAdjust = 0;

if (dDate2 < dDate1) return -1; // error code if dates transposed

var iWeekday1 = dDate1.getDay(); // day of week

var iWeekday2 = dDate2.getDay();

iWeekday1 = (iWeekday1 == 0) ? 7 : iWeekday1; // change Sunday from 0 to 7

iWeekday2 = (iWeekday2 == 0) ? 7 : iWeekday2;

if ((iWeekday1 > 5) && (iWeekday2 > 5)) iAdjust = 1; // adjustment if both days on weekend

iWeekday1 = (iWeekday1 > 5) ? 5 : iWeekday1; // only count weekdays

iWeekday2 = (iWeekday2 > 5) ? 5 : iWeekday2;

// calculate difference in weeks (1000mS * 60sec * 60min * 24hrs * 7 days = 604800000)

iWeeks = Math.floor((dDate2.getTime() – dDate1.getTime()) / 604800000)

if (iWeekday1 <= iWeekday2) {

iDateDiff = (iWeeks * 5) + (iWeekday2 – iWeekday1)

} else {

iDateDiff = ((iWeeks + 1) * 5) – (iWeekday1 – iWeekday2)

}

iDateDiff -= iAdjust // take into account both days on weekend

return (iDateDiff + 1); // add 1 because dates are inclusive

}

Problem #2 was the calculation of the end date.
Adding a month is not a function in standard JS… so I tried

Let’s say the start date was December 1st this year, which in CRM looks like this:

Wed Dec 1 10:27:00 UTC+0100 2010 [Object]

If I calculate my end date in the old school fashion JS:

New Date.setDate(startDate.getDate() + 90) 
My date will look like this 
"Wed Dec 1 10:27:00 UTC+0100 201090" [string] 
MS CRM will handle this string, when a field is set to this value. 
However de calcBusinessDays function required a Date Object and not a string. 

Solution #2

http://www.datejs.com/ is the solution here.

Add the Data.js to be loaded in the <CRM Install Folder>\_static\_common\scripts\global.js

document.write(‘<script language=”javascript” src=”\/_customJava\/customDate.js”><\/script>’)

The calculation then looks like this:

crmForm.all.new_expectedrevenue.DataValue = calcBusinessDays(crmForm.all.new_startdate.DataValue, crmForm.all.new_enddate.DataValue.add(3).month()) * crmForm.all.new_rateperhour.DataValue;

The date function in the DateJS library do return Date objects.

Other examples of the DataJS library are below… it’s a very powerful library.

// Get today’s date

Date.today();

// Add 5 days to today

Date.today().add(5).days();

// Get Friday of this week

Date.friday();

// Get March of this year

Date.march();

// Is today Friday?

Date.today().is().friday(); // true|false

// What day is it?

Date.today().getDayName();

// Get the first Monday of the year

Date.january().first().monday()

// Get the last Friday of the year

Date.dec().final().fri()

// Set a date to the 15th of the current month at 4:30 PM,

// then add 90 days and make sure that date is a weekday,

// else move to the next weekday.

var d1 = Date.today()

.set({ day: 15, hour: 16, minute: 30 })

.add({ days: 90 })

if (!d1.isWeekday()) {

d1.next().monday();

}

// Lets start simple. “Today”

Date.parse(‘today’);

// How about tomorrow?

Date.parse(‘tomorrow’);

// July 8?

Date.parse(‘July 8’);

// With a year?

Date.parse(‘July 8th, 2007’);

// And time?

Date.parse(‘July 8th, 2007, 10:30 PM’);

// Get the date, move to Monday (if not already Monday),

// then alert the date to the user in a different format.

var d1 = Date.parse(‘8-Jul-2007’);

if (!d1.is().monday()) {

d1.last().monday();

}

alert(d1.toString(‘dddd, MMMM d, yyyy’));


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