The default label maker for one chart. Whether timestamps carry a time of
day is decided once for the whole chart, so every layer spells the same bar
the same way -- the x values are what keep the layers in step with each
other as the reader moves between them.
The default label maker for one chart. Whether timestamps carry a time of day is decided once for the whole chart, so every layer spells the same bar the same way -- the x values are what keep the layers in step with each other as the reader moves between them.