I have encountered some weird formatting in the PBI Service, that is not occurring in the desktop application.
In one of my reports, I have a clustered column chart with date (type: continuous) along the X-Axis and a date list slicer for years, quarters and months. The date format on the chart when the slicer is unfiltered, or when a year or quarter is selected, is 'MMM YYYY' as expected.
However, when I select a single month from the date list slicer, the format is inconsistent - sometimes it is 'MMM YYYY' but other times, it is 'DD MMM hh:mm', or sometimes 'YYYY' only.
Something appears to have gone awry with the interaction at the month level. Please may you investigate?
I tried to reproduce your problem, but my result is that the time display on Power BI Service is the same as in Power BI Desktop. Am I missing something? Can you provide a sample pbix or tell me the detailed reproduction steps? Does this issue occur in other reports?