inweektodate - script and chart function

This function returns True if timestamp lies inside the part of week containing base_date up until and including the last millisecond of base_date.

Syntax:

InWeekToDate (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 week.
period_no	The week can be offset by period_no. period_no is an integer, where the value 0 indicates the week which contains base_date. Negative values in period_no indicate preceding weeks and positive values indicate succeeding weeks.
first_week_day	By default, the first day of the week is Monday,starting at midnight between Sunday and Monday. To indicate the week starting on another day, specify an offset in first_week_day. This may be given as a whole number of days and/or fractions of a day.

Example

Result

inweektodate ('12/01/2006', '12/01/2006', 0)

Returns True

inweektodate ('12/01/2006', '11/01/2006', 0)

Returns False

inweektodate ('12/01/2006', '18/01/2006', -1)

Returns False
Because period_no is specified as -1, the effective data that timestamp is measured against is 11/01/2006.

inweektodate ( '11/01/2006', '12/01/2006', 0, 3 )

Returns False
Because first_week_day is specified as 3 (Thursday), which makes 12/01/2006 the first day of the week following the week containing 12/01/2006.

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 during the fourth week after the week in base_date, by specifying period_no as 4, but before the value of base_date.

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 *,

InWeekToDate(InvDate, '11/01/2013', 4) AS InWeek2DPlus4

Resident TempTable;

Drop table TempTable;

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

InvDate	InWeek2DPlus4
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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