Weird behaviour with DATETOSTRING_LOCAL in DQL statements
I am experiencing weird behaviour with the
DATETOSTRING_LOCAL function in DQL while trying to group objects based on day.
It behaves identically to the normal
DATETOSTRING function unless when it is used in a subquery.
(The real life queries are more complicated than the examples below to illustrate the issue.)
Example 1: normal usage - no issues here
Example 2: the normal
DATETOSTRING method behaving as it should
You see the subquery returns the dates correctly as a string in a short format YYYY-MM-dd and the main query can group on it.
Example 3: the localised
DATETOSTRING_LOCAL method behaving differently (incorrectly) while using the same query as Example 2
It doesn't format correctly.
Does anybody know why? Is this a bug or an expected, albeit weird, result?