[Cogsvcs] LUIS - public issue 53837

Author: diberry

articles/cognitive-services/LUIS/luis-concept-data-alteration.md

@@ -2,7 +2,7 @@
 title: Data alteration - LUIS
 description: Learn how data can be changed before predictions in Language Understanding (LUIS)
 ms.topic: conceptual
-ms.date: 02/11/2020
+ms.date: 05/05/2020
 ---
 
 # Alter utterance data before or during prediction
@@ -71,14 +71,15 @@ The Bing spell check API used in LUIS does not support a list of words to ignore
 When a LUIS app uses the prebuilt [datetimeV2](luis-reference-prebuilt-datetimev2.md) entity, a datetime value can be returned in the prediction response. The timezone of the request is used to determine the correct datetime to return. If the request is coming from a bot or another centralized application before getting to LUIS, correct the timezone LUIS uses.
 
 ### Endpoint querystring parameter
-The timezone is corrected by adding the user's timezone to the [endpoint](https://go.microsoft.com/fwlink/?linkid=2092356) using the `timezoneOffset` param. The value of `timezoneOffset` should be the positive or negative number, in minutes, to alter the time.
+The timezone is corrected by adding the user's timezone to the endpoint using the appropriate parameter based on the API version. The value of the parameter should be the positive or negative number, in minutes, to alter the time.
 
-|Param|Value|
+|API version|Querystring parameter|
 |--|--|
-|`timezoneOffset`|positive or negative number, in minutes|
+|v2|`timezoneOffset`|
+|v3|`datetimeReference`|
 
 ### Daylight savings example
-If you need the returned prebuilt datetimeV2 to adjust for daylight savings time, you should use the `timezoneOffset` querystring parameter with a +/- value in minutes for the [endpoint](https://go.microsoft.com/fwlink/?linkid=2092356) query.
+If you need the returned prebuilt datetimeV2 to adjust for daylight savings time, you should use the querystring parameter with a +/- value in minutes for the [endpoint](https://go.microsoft.com/fwlink/?linkid=2092356) query.
 
 #### [V2 prediction endpoint request](#tab/V2)
 
@@ -94,18 +95,20 @@ Remove 60 minutes:
 
 Add 60 minutes:
 
-`https://{region}.api.cognitive.microsoft.com/luis/v3.0-preview/apps/{appId}/slots/production/predict?query=Turn the lights on?**timezoneOffset=60**&spellCheck={boolean}&bing-spell-check-subscription-key={string}&log={boolean}`
+`https://{region}.api.cognitive.microsoft.com/luis/v3.0-preview/apps/{appId}/slots/production/predict?query=Turn the lights on?**datetimeReference=60**&spellCheck={boolean}&bing-spell-check-subscription-key={string}&log={boolean}`
 
 Remove 60 minutes:
 
-`https://{region}.api.cognitive.microsoft.com/luis/v3.0-preview/apps/{appId}/slots/production/predict?query=Turn the lights on?**timezoneOffset=-60**&spellCheck={boolean}&bing-spell-check-subscription-key={string}&log={boolean}`
+`https://{region}.api.cognitive.microsoft.com/luis/v3.0-preview/apps/{appId}/slots/production/predict?query=Turn the lights on?**datetimeReference=-60**&spellCheck={boolean}&bing-spell-check-subscription-key={string}&log={boolean}`
 
 Learn more about the [V3 prediction endpoint](luis-migration-api-v3.md).
 
 * * *
 
-## C# code determines correct value of timezoneOffset
-The following C# code uses the [TimeZoneInfo](https://docs.microsoft.com/dotnet/api/system.timezoneinfo) class's [FindSystemTimeZoneById](https://docs.microsoft.com/dotnet/api/system.timezoneinfo.findsystemtimezonebyid#examples) method to determine the correct `timezoneOffset` based on system time:
+## C# code determines correct value of parameter
+The following examples .
+
+The following C# code uses use the v2 API parameter, and the [TimeZoneInfo](https://docs.microsoft.com/dotnet/api/system.timezoneinfo) class's [FindSystemTimeZoneById](https://docs.microsoft.com/dotnet/api/system.timezoneinfo.findsystemtimezonebyid#examples) method to determine the correct `timezoneOffset` based on system time:
 
 ```csharp
 // Get CST zone id