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inmonths - script and chart function

This function finds if a timestamp falls within the same month, bi-month, quarter, four-month period, or half-year as a base date. It is also possible to find if the timestamp falls within a previous or following time period.


InMonths(n_months, timestamp, base_date, period_no [, first_month_of_year])

Return data type: Boolean


InMonths arguments
Argument Description

The number of months that defines the period. An integer or expression that resolves to an integer that must be one of: 1 (equivalent to the inmonth() function), 2 (bi-month), 3 (equivalent to the inquarter() function), 4 (four-month period), or 6 (half year).

timestamp The date that you want to compare with base_date.
base_date Date that is used to evaluate the period.

The period can be offset by period_no, an integer, or expression resolving to an integer, where the value 0 indicates the period that contains base_date. Negative values in period_no indicate preceding periods and positive values indicate succeeding periods.


If you want to work with (fiscal) years not starting in January, indicate a value between 2 and 12 in first_month_of_year.

Examples and results:  

These examples use the date format DD/MM/YYYY. The date format is specified in the SET DateFormat statement at the top of your load script. Change the format in the examples to suit your requirements.

Example 1:  

inmonths(4, '25/01/2013', '25/04/2013', 0)

Returns True. Because the value of timestamp, 25/01/2013, lies within the four-month period 01/01/2013 to 30/04/2013, in which the value of base_date, 25/04/2013 lies.

Example 2:  

inmonths(4, '25/05/2013', '25/04/2013', 0)

Returns False. Because 25/05/2013 is outside the same period as the previous example.

Example 3:  

inmonths(4, '25/11/2012', '01/02/2013', -1 )

Returns True. Because the value of period_no, -1, shifts the search period back one period of four months (the value of n-months), which makes the search period 01/09/2012 to 31/12/2012.

Example 4:  

inmonths( 4, '25/05/2006', '01/03/2006', 0, 3)

Returns True. Because the value of first_month_of_year is set to 3, which makes the search period 01/03/2006 to 30/07/2006 instead of 01/01/2006 to 30/04/2006.

Example 5:  

Add the example script to your document and run it. Then add, at least, the fields listed in the results column to a sheet in your document to see the result.

This example checks if the invoice date in the table falls in the bi-month period that includes the base_date shifted forwards by one bi-month period (by specifying period_no as 1).


LOAD RecNo() as InvID, * Inline [


















InMonths(2, InvDate, '11/02/2013', 1) AS InMthsPlus1

Resident TempTable;

Drop table TempTable;

The resulting table contains the original dates and a column with the return value of the InMonths() function.

The search period is 01/03/2013 to 30/04/2013, because the value of base_date is shifted forwards two months from the value in the function (11/02/2013).

Example 5 results
InvDate InMthsPlus1
28/03/2012 0 (False)
10/12/2012 0 (False)
5/2/2013 0 (False)
31/3/2013 -1 (True)
19/5/2013 0 (False)
15/9/2013 0 (False)
11/12/2013 0 (False)
2/3/2014 0 (False)
14/5/2014 0 (False)
13/6/2014 0 (False)
7/7/2014 0 (False)
4/8/2014 0 (False)

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