When you are working with a time series chart, you may want to set a different format for the base axis labels. Let's suppose you want to have a chart that is listening to a time selector. If you select one-year old data to be displayed on the chart, certainly you are not interested in seeing the minutes on the date label. However, if you want to display the last hour, the ticks of the base axis need to be presented in minutes.
There is an extension point we can use to get a conditional format based on the scale of the base axis. The extension point is baseAxisScale_tickFormatter, and it can be used like in the code as follows:
baseAxisScale_tickFormatter: function(value, dateTickPrecision) {
switch(dateTickPrecision) {
case pvc.time.intervals.y:
return format_date_year_tick(value);
break;
case pvc.time.intervals.m:
return format_date_month_tick(value);
break;
...