inlunarweek - script and chart function

This function returns true if timestamp lies inside the lunar week containing base_date. Lunar weeks in QlikView are defined by counting 1 January as the first day of the week.

Syntax:  

InLunarWeek (timestamp, base_date, period_no[, first_week_day])

Return data type: Boolean

Arguments:  

Example 1:  

inlunarweek('12/01/2013', '14/01/2013', 0)

Returns True. Because the value of timestamp, 12/01/2013 falls in the week 08/01/2013 to 14/01/2013.

Example 2:  

inlunarweek('12/01/2013', '07/01/2013', 0)

Returns False. Because the base_date 07/01/2013 is in the lunar week defined as 01/01/2013 to 07/01/2013.

Example 3:  

inlunarweek('12/01/2013', '14/01/2013', -1)

Returns False. Because specifying a value of period_no as -1 shifts the week to the previous week, 01/01/2013 to 07/01/2013.

Example 4:  

inlunarweek('07/01/2013', '14/01/2013', -1)

Returns True. In comparison with the previous example, the timestamp is in the week after taking into account the shift backwards.

Example 5:  

inlunarweek('11/01/2006', '08/01/2006', 0, 3)

Returns False. Because specifying a value for first_week_day as 3 means the start of the year is calculated from 04/01/2013, and so the value of base_date falls in the first week, and the value of timestamp falls in the week 11/01/2013 to 17/01/2013.

Example 6:  

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 an invoice date falls in the week shifted from the value of base_date by four weeks.

TempTable:

LOAD RecNo() as InvID, * Inline [

InvDate

28/03/2012

10/12/2012

5/2/2013

31/3/2013

19/5/2013

15/9/2013

11/12/2013

2/3/2014

14/5/2014

13/6/2014

7/7/2014

4/8/2014

];

 

InvoiceData:

LOAD *,

InLunarWeek(InvDate, '11/01/2013', 4) AS InLWeekPlus4

Resident TempTable;

Drop table TempTable;

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

The function returns True for the value of InvDate5/2/2013 because the value of base_date, 11/01/2013, is shifted by four weeks, and so falls in the week 5/02/2013 to 11/02/2013.