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daystart - script and chart function

This function returns a value corresponding to a timestamp with the first millisecond of the day contained in the time argument. The default output format will be the TimestampFormat set in the script.


DayStart(time[, [period_no[, day_start]])

Return data type: dual


DayStart arguments
Argument Description
time The timestamp to evaluate.
period_no period_no is an integer, or expression that resolves to an integer, where the value 0 indicates the day that contains time. Negative values in period_no indicate preceding days and positive values indicate succeeding days.
day_start To specify days not starting at midnight, indicate an offset as a fraction of a day in day_start. For example, 0.125 to denote 3 AM.

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:  

daystart('25/01/2013 16:45:00')

Returns 25/01/2013 00:00:00.

Example 2:  

daystart('25/01/2013 16:45:00', -1)

Returns 24/01/2013 00:00:00.

Example 3:  

daystart('25/01/2013 16:45:00', 0, 0.5 )

Returns 25/01/2013 12:00:00.

Example 4:  

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 finds the timestamp that marks the beginning of the day after each invoice date in the table.


LOAD RecNo() as InvID, * Inline [


















DayStart(InvDate, 1) AS DStart

Resident TempTable;

Drop table TempTable;

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

Example 4 results
InvDate DStart
28/03/2012 29/03/2012 00:00:00
10/12/2012 11/12/2012 00:00:00
5/2/2013 06/02/2013 00:00:00
31/3/2013 01/04/2013 00:00:00
19/5/2013 20/05/2013 00:00:00
15/9/2013 16/09/2013 00:00:00
11/12/2013 12/12/2013 00:00:00
2/3/2014 03/03/2014 00:00:00
14/5/2014 15/05/2014 00:00:00
13/6/2014 14/06/2014 00:00:00
7/7/2014 08/07/2014 00:00:00
4/8/2014 05/08/2014 00:00:00

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