inlunarweek - script and chart function

This function finds if timestamp lies inside the lunar week containing base_date. Lunar weeks in Qlik Sense 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:

Argument	Description
timestamp	The date that you want to compare with base_date.
base_date	Date that is used to evaluate the lunar week.
period_no	The lunar week can be offset by period_no. period_no is an integer, where the value 0 indicates the lunar week which contains base_date. Negative values in period_no indicate preceding lunar weeks and positive values indicate succeeding lunar weeks.
first_week_day	An offset that may be greater than or less than zero. This changes the beginning of the year by the specified number of days and/or fractions of a day.

Example

Result

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.

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.

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.

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.

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.

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

InvDate	InLWeekPlus4
28/03/2012	0 (False)
10/12/2012	0 (False)
5/2/2013	-1 (True)
31/3/2013	0 (False)
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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