How to change DayOfWeek() to start from own day

Question

I want to change the DayOfWeek() function so that I can get dates according to my own desired first day of the week. So what I am doing in this code is that I am setting a startDate, endDate and selectDays that I want to check. Here is my code:

<cfscript>

function Mydayofweek(date, day_1)
{   
    return (((DayOfWeek(date) + (7 -day_1)) MOD 7) +1);
}

</cfscript>

<cfset startDate = '07/01/2013'>
<cfset endDate = '07/25/2013'>
<Cfset mydates = ''>
<cfset selectDays = '2,6'>

<cfset MyWeekFirstDay = 6> <!---I selected Friday = 6 --->
<cfset new = ''>

<cfoutput>
    <cfloop list="#selectDays#" delimiters="," index="d">
        <cfset new &=  '#Mydayofweek(d, MyWeekFirstDay)#,' >
    </cfloop>


<cfif new NEQ ''>
    <cfset ScheduleDate = left(new, (len(new)-1) )>
</cfif>

<cfdump var="#ScheduleDate#"><br />
</cfoutput>
<cfset AppendToMyDates = false>
 <cfloop from="#startDate#" to="#endDate#" index="day">
 <cfif AppendToMyDates is false and DayOfWeek(day) is ListFirst(selectDays)>
 <cfset AppendToMyDates = true>
 </cfif>

    <cfif listfind(ScheduleDate, DayOfWeek(day), ',') NEQ 0 and AppendToMyDates is true>

      <cfset mydates &= "#dateformat(day, 'mmm, dd, yyyy dddd')#,<br />">

    </cfif>
    </cfloop><cfoutput>#mydates#</cfoutput> 

This is written in ColdFusion. That code generates this output:

4,1
Jul, 03, 2013 Wednesday,
Jul, 07, 2013 Sunday,
Jul, 10, 2013 Wednesday,
Jul, 14, 2013 Sunday,
Jul, 17, 2013 Wednesday,
Jul, 21, 2013 Sunday,
Jul, 24, 2013 Wednesday,

The Output Should be like this because i select Friday = 1 to Thursday = 7 so the above days selectDays = '2,6' should now point to selectDays = '7,4' with respect to my first days 2,6

7,4
Jul, 06, 2013 Saturday,
Jul, 10, 2013 Wednesday,
Jul, 13, 2013 Saturday,
Jul, 17, 2013 Wednesday,
Jul, 20, 2013 Saturday,
Jul, 24, 2013 Wednesday,

I have set my selectDays = '2,6' it means I want to get dates of Saturday and Wednesday because I have set 6 as my week first day and it start from Friday (by default it was sunday). My days start from Sunday Sunday = 1 , Monday = 2 , Tuesday = 3 , Wednesday = 4 , Thursday = 5 , Friday = 6 , Saturday = 7 and now I changed my date start from Friday = 1 , Saturday = 2 ,Sunday = 3 , Monday = 4 , Tuesday = 5 , Wednesday = 6 , Thursday = 7 in script function. Actually I think there is error in my script function that i don't understand. Please help me out to find the problem and it's solution thanks

UPDATED

Answer 1

You just need to call your script into your loop. No need to make any function just change the code like this one. Copy this code hope this will solve your problem.

<cfscript>
  function Mydayofweek(date, day_1)
  {   
     return (((DayOfWeek(date) + (7 -day_1)) MOD 7) +1);
  } 
</cfscript>

<cfset startDate = '07/01/2013'>
<cfset endDate = '07/25/2013'>
<Cfset mydates = ''>
<cfset selectDays = '2,6'>
<cfset MyWeekFirstDay = 6><!---I selected Friday = 6 --->


<cfloop from="#startDate#" to="#endDate#" index="day">
  <cfif listfind(selectDays, Mydayofweek(day,MyWeekFirstDay), ',') NEQ 0 >
    <cfset mydates &= "#dateformat(day, 'mmm, dd, yyyy dddd')#,<br />">
  </cfif>
</cfloop>
<cfoutput>#mydates#</cfoutput>