Highlight (shade) plot background in specific time range

Question

On a generic plot, with time on the x-axis, I would like to highlight a period of some specific years.

How can I bestly do this? My idea is for example a light yello

Answer 1

You can use the chartSeries() function in quantmod with an xts timeSeries and the addTA() function to add the background highlighting:

addTA(xts(rep(TRUE,length(times)), times), on=-1, col="#333333", border=NA)