X axis of Time Series does not show proper date formats

[phellstrand77]

Make sure these boxes are checked before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.

Superset version

0.29.0rc8

Expected results

Expecting 'Dual Axis Line Chart' to display X axis with proper dates; e.g. 1970, 1971, 1972, etc. or Jan 1 2008, Jan 2 2008, Jan 3 2008, etc; whatever data exist and date level selected.

Actual results

The X axis does not show proper date formats. Attached show the results from the demo 'Birth' dashboard. Same erroneous results is aceived when using other datasets too. When using other BI, e.g. Tableau, the X axis shows dates correctly using the same datasets.

Steps to reproduce

Simply view the 'Birth' demo dashboard, when explore the 'Average and Sum Trends' chart.

[phellstrand77]

Another example from a different dataset.

[ghost]

This issue was moved by kristw to apache-superset/superset-ui-plugins#50.

[ebauch]

Quick question: This issue does still exist in v. 0.34 and seems to have no activity in the UI plugins repo. What is the general procedure when an issue is moved outside of the incubator repo to the UI plugins repo like in this case?