Change the legend's timestamp format in R dygraphs

Question

I'm charting a time series with dygraphs in R like the following:

library(dygraphs)
library(htmlwidgets)
library(data.table)

now <- Sys.time()
dataset <- data.table(time = as.POSIXct(now+1:10),value = 1:10)
d <- dygraph(dataset) 

The date format displayed in the legend depends in the machine locale and I cannot leave it fixed.

The labels of the x axis can be formatted as follows:

valueFormatter<-"function formatValue (ms) {
                return ms.toISOString();
}"

d <- d%>%dyAxis("x", axisLabelFormatter=JS(valueFormatter))

However, I don't know how to do it for the legend.

Answer 1

Similar to axisLabelFormatter there is legendForamtter. See for examples:

https://github.com/danvk/dygraphs/pull/683 http://dygraphs.com/tests/legend-formatter.html