[ZH DatetimeV2] Behavior change for month and day order in resolution

[omarelhariry]

Describe the bug
There is a behavior change in the resolution for DateTime entity for chinese. The query "12/1" used to be detected as Dec 1st but now it is detected as Jan 12th.

To Reproduce
Create a test file that calls DateTimeModel.Parse method with a test case of "12/1".
Validate returned result.
Use 2 different versions, I used versions 1.3.2 and 1.4.0, (one lower and one higher than or equal to 1.4) the lower version detects Dec 1st while the higher version detects Jan 12th.

Expected behavior
Resolution to be Dec 1st. "XXXX-12-01"

Sample input/output
Input:
"12/1"

Faulty output:
Jan 12th "XXXX-01-12"

Expected output:
Dec 1st "XXXX-12-01"

Platform (please complete the following information):

• Platform: .NET
• Environment: nuget package/LUIS
• Version of package v1.3.2 and v1.4.0

Additional context

[tellarin]

@omarelhariry, this was actually a correction of the designed behaviour. By design the default order if DD/MM, so 12/Jan is the "correct" output for "12/1" as a date. Unfortunately, in pre v1.4.0 there were some inconsistencies were some cases returned 12/Jan and others 1/Dec.
There is a feature in the pipeline to allow consumers to specify which format/order to use in such potentially ambiguous cases, but there's no ETA currently for when it will be out.

[tellarin]

This issue was not actually related to the format consistency changes. A previous bug fix introduced a side-effect in Chinese that changed the default behaviour there. This has been cleaned-up in #2411.