• From Hexadecimal to RGB
• From RGB to Hexadecimal
• Check for a valid hexadecimal value

    	FormatAddCommas(val) {
    		Result:=val
    		StringLen, OutputVar, Result
    		NumLoop := (OutputVar // 3)
    		DNum = 3
    		Loop, % (NumLoop+1)
    		{
    		   StringRight,Digit,Result,%DNum%
    		   StringReplace, Result, Result, %Digit%,`,%Digit%
    		   DNum += 4
    		}
    		StringLen, OutputVar, Result
    		Loop, %OutputVar%
    		{
    			FirstChar:=Substr(Result, 1, 1)
    			IfEqual, FirstChar, `,
    			{
    				Result:=Substr(Result, 2)
    			} else {
    				break
    			}
    		}
    		Return Result
    	}

Just a quick note for the moment on how to use ternary operators in AutoHotkey.  A ternary operator for those who are unfamiliar with this is an "If...Then...Else..." statement written in a small amount of code, usually on one line, and exists in most programming languages.

For Example, the statement:

If (ThisCondition = true)
    ThisVar:=1
Else
    ThisVar:=2

Converted to Ternary this would look like:

ThisVar:=(ThisCondition = true) ? 1 : 2

 In this case, I want to display the current month with today highlighted.  As I was trying to get my head round writing this in a program using the qHTM.dll (to include HTML in an autohotkey GUI), the calendar will be in a HTML-autohotkey mixed code.  Obviously just omit the HTML rubbish if you want to create a calendar using just autohotkey syntax.

Actually, the following code is an excerpt from my program which checks an online server (for IT Events during this month) and if it can't download the calendar, it had to display an offline version in the GUI.  To display the following code in this website though, I've had to omit a lot of the HTML part.