lunarweekstart - script and chart function

This function returns a value corresponding to a timestamp of the first millisecond of the lunar week containing date. Lunar weeks in Qlik Sense are defined by counting 1 January as the first day of the week.

Syntax:

LunarweekStart(date[, period_no[, first_week_day]])

Return data type: dual

Arguments:

Argument	Description
date	The date to evaluate.
period_no	period_no is an integer or expression resolving to an integer, where the value 0 indicates the lunar week which contains 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.

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

Example

Result

lunarweekstart('12/01/2013')

Returns 08/01/2013.

lunarweekstart('12/01/2013', -1)

Returns 01/01/2013.

lunarweekstart('12/01/2013', 0, 1 )

Returns 09/01/2013.
Because the offset specified by setting first_week_day to 1 means the beginning of the year is changed to 02/01/2013.

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 finds the first day of the lunar week of each invoice date in the table, where the date is shifted by one week by specifying period_no as 1.

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 *,

LunarWeekStart(InvDate, 1) AS LWkStart

Resident TempTable;

Drop table TempTable;

The resulting table contains the original dates and a column with the return value of the lunarweekstart() function. You can display the full timestamp by specifying the formatting in the properties panel.

InvDate	LWkStart
28/03/2012	01/04/2012
10/12/2012	16/12/2012
5/2/2013	12/02/2013
31/3/2013	02/04/2013
19/5/2013	21/05/2013
15/9/2013	17/09/2013
11/12/2013	17/12/2013
2/3/2014	05/03/2014
14/5/2014	21/05/2014
13/6/2014	18/06/2014
7/7/2014	09/07/2014
4/8/2014	06/08/2014

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