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# Date Formula: Last business day - 2 of prior month

So I need two date formulas:

1. Calculate the third to last business day of the month (last business day - 2) of the PRIOR month.
2. Calculate the third to last business day of the month (last business day - 2) of the CURRENT month.
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IO_Dork
• 8
• 8
2 Solutions

Commented:
Last Month
``````DateSerial(Year(CurrentDate), Month(CurrentDate), -2)
``````

CurrentMonth
``````DateSerial(Year(CurrentDate), Month(CurrentDate)+1, -2)
``````

mlmcc
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Author Commented:
but does that handle just business days? or just any calendar day? Needs to calculate based on business days only.
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Commented:
That is just calendar days.

I'll work on it for business days

mlmcc
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Commented:
Is "business days" just Mon - Fri, or something else?  Are holidays a factor?

Since you didn't specify, I'm guessing that it's just Mon - Fri, but I thought I'd check.

James
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Author Commented:
Correct, Just mon - fri.
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Commented:
DO you have the last day of the month available or do you need to calculate that?

mlmcc
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Author Commented:
Need to calculate that
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Commented:
Here is the basic formula for 3rd workday

``````WhilePrintingRecords;
If DayofWeek({Sheet2_.End Of Month}) in [1,2,3] then
{Sheet2_.End Of Month} - 4
Else if DayofWeek({Sheet2_.End Of Month}) = 7 then
{Sheet2_.End Of Month} - 3
Else
{Sheet2_.End Of Month} - 2
``````

mlmcc
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Commented:
Updated to calculate last day of month based on current date

Name - Last Day Of Current Month
``````WhilePrintingRecords;
Local DateVar LastDay;
LastDay := DateSerial(Year(CurrentDate), Month(CurrentDate) + 1, 0);
If DayofWeek(LastDay ) in [1,2,3] then
LastDay  - 4
Else if DayofWeek(LastDay ) = 7 then
LastDay - 3
Else
LastDay  - 2
``````

Name - Last Day Of PreviousMonth
``````WhilePrintingRecords;
Local DateVar LastDay;
LastDay := DateSerial(Year(CurrentDate), Month(CurrentDate), 0);
If DayofWeek(LastDay ) in [1,2,3] then
LastDay  - 4
Else if DayofWeek(LastDay ) = 7 then
LastDay  - 3
Else
LastDay  - 2
``````

mlmcc
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Author Commented:
mlmcc:

So I am trying to reference this field in another formula field and I get the following error...will it not be possible to reference the result of this formula field? Ultimately, I need to reference this field to conditionally sum a different field.

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Commented:
Take the WhilePrintingRecords line out of the formulas

mlmcc
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Author Commented:
thanks, works perfectly!
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Author Commented:
ok, so its been a few months since I accepted this solution, but now it does not seem to be working. I ran a report that brought back December 2016 records and the formulas were supposed to calculate the third to last business day of the current month and third to last day of prior month.

December 2016 should have been 12/27 because the last business day was 12/30  - but the formula returns 12/28.

November 2016 should have been 11/25 b/c the last business day was 11/30 and there was weekend in between - but formula returns 11/28.
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Commented:
How are you figuring the dates?

By your definition above it is working

Dec 2016 - Last working day is 30 Dec 2016 - 2 days is 28 Dec 2016
Same for November.  Last working day is a Wednesday so 30 Nov 2016 - 2 is 28 Nov 2016
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Author Commented:
right, I guess I mean 4 days before end of month....i was thinking 3 b/c take 12/27 and add 3days. so what part or parts of the formula should I change to return the 4th to last business day?
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Commented:
Try this

``````WhilePrintingRecords;
Local DateVar LastDay;
LastDay := DateSerial(Year(CurrentDate), Month(CurrentDate), 0);
If DayofWeek(LastDay ) in [1,2,3,4] then
LastDay  - 5
Else if DayofWeek(LastDay ) = 7 then
LastDay  - 4
Else
LastDay  - 3
``````
1

Author Commented:
Thanks, those are the changes I figured would have to be done, but wasn't sure.
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