Alexa built-in slot AMAZON.DATE - amazon-web-services

Question

When using the built-in slot AMAZON.DATE, "next week" is interpreted as 2016-W38 per the developer reference.
Utterances that map to just a specific week (such as “this week” or
“next week”), convert a date indicating the week number: 2015-W49.
I am trying to parse this in SQL. Is the first week of the year W1 or W01 when using the Alexa services? Thanks.

Answer 1

UPDATED: Dates are in ISO-8601 date format. First week is W01, there is no W00.
Reference: https://en.wikipedia.org/wiki/ISO_8601#Dates
Source: https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/alexa-skills-kit-interaction-model-reference
Original answer:
I can't find docs, but here is the answer...
Today is Wed 28th sept, day 272.
Alexa says this is 2016-W39. (I just checked).
2016 started on a Friday, so W39 started last Friday on day 267 which is 38 weeks after Jan 1st. (267/7=38.14).
Count back 38 weeks to start of year.
Therefore, first week of the year is called W1.

Answer 2

This is how I ended up parsing the AMAZON.DATE built-in slot using a SQL Server stored procedure.
CREATE PROCEDURE [dbo].[procMomaAlexaExhibitions]
#p_alexa_date VARCHAR(50) = ''
AS
BEGIN
SET NOCOUNT ON;
DECLARE #p_start_date VARCHAR(10) = ''
DECLARE #p_end_date VARCHAR(10) = ''
--SET #p_alexa_date = '2015-W20-WE'
-- Today if null
IF(#p_alexa_date = '' OR #p_alexa_date IS NULL)
BEGIN
SET #p_start_date = (SELECT CONVERT(VARCHAR(10), GETDATE(), 121))
SET #p_end_date = (SELECT CONVERT(VARCHAR(10), GETDATE(), 121))
END
-- Alexa provided a normal date
IF(ISDATE(#p_alexa_date) = 1)
BEGIN
SET #p_start_date = CONVERT(VARCHAR(10), #p_alexa_date, 121)
SET #p_end_date = CONVERT(VARCHAR(10), #p_alexa_date, 121)
END
-- Alexa provided a year-month
IF(LEN(#p_alexa_date) <= 8 AND ISNUMERIC(REPLACE(#p_alexa_date,'-','')) = 1)
BEGIN
SET #p_start_date = #p_alexa_date + '-01'
SET #p_end_date = #p_alexa_date + '-31'
END
-- weekend
IF(RIGHT(#p_alexa_date, 3) = '-WE')
BEGIN
DECLARE #p_week VARCHAR(2)
DECLARE #p_year VARCHAR(4)
DECLARE #p_start_date_wk VARCHAR(10) = ''
DECLARE #p_end_date_wk VARCHAR(10) = ''
SET #p_week = REPLACE(SUBSTRING(#p_alexa_date,7, LEN(#p_alexa_date)),'-WE','')
SET #p_year = LEFT(#p_alexa_date, 4)
SET #p_start_date_wk = CONVERT(VARCHAR(10), DATEADD(wk, DATEDIFF(wk, 6, '1/1/' + #p_year) + (#p_week-1), 6), 121)
SET #p_end_date_wk = CONVERT(VARCHAR(10), DATEADD(wk, DATEDIFF(wk, 5, '1/1/' + #p_year) + (#p_week-1), 5), 121)
SET #p_start_date = CASE WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime)) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime), 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 1) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 1, 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 2) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 2, 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 3) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 3, 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 4) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 4, 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 5) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 5, 121)
WHEN datename(weekday, CAST(#p_start_date_wk AS smalldatetime) + 6) = 'Saturday' THEN CONVERT(VARCHAR(10), CAST(#p_start_date_wk AS smalldatetime) + 6, 121)
END
SET #p_end_date = CASE WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime)) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime), 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 1) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 1, 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 2) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 2, 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 3) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 3, 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 4) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 4, 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 5) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 5, 121)
WHEN datename(weekday, CAST(#p_end_date_wk AS smalldatetime) + 6) = 'Sunday' THEN CONVERT(VARCHAR(10), CAST(#p_end_date_wk AS smalldatetime) + 6, 121)
END
END
-- not a weekend
IF((#p_alexa_date LIKE '%-W%') AND (RIGHT(#p_alexa_date, 3) <> '-WE'))
BEGIN
SET #p_week = SUBSTRING(#p_alexa_date,7, LEN(#p_alexa_date))
SET #p_year = LEFT(#p_alexa_date, 4)
SET #p_start_date = CONVERT(VARCHAR(10), DATEADD(wk, DATEDIFF(wk, 6, '1/1/' + #p_year) + (#p_week-1), 6), 121)
SET #p_end_date = CONVERT(VARCHAR(10), DATEADD(wk, DATEDIFF(wk, 5, '1/1/' + #p_year) + (#p_week-1), 5), 121)
END
From there you can do things like this in SQL. FYI
WHERE (ExhVenuesXrefs.BeginISODate <= #p_start_date)
AND (ExhVenuesXrefs.EndISODate >= #p_end_date)