Date.Format for javascript date

I have an array of

struct {
    Date         time.Time
    PostedSample int
}

loaded from the appengine datastore which I want to output in a html/template for the <a href="https://developers.google.com/chart/interactive/docs/gallery/annotatedtimeline#Data_Format">Google Visualization Time Line</a>. First I tried formatting the Date directly in the template with {{.Date.Format "new Date(2006,1,2,15,4,5)"}} but html/template escapes this so it appears as a quoted string in the html source. I then tried formatting the date into a []struct{Date template.JS; Value template.JS} with the expression template.JS(m.Date.Format("new Date(2006,1,2,15,4,5)")) which almost works except the month is off by one, javascript wants January as 0. I could have the template generate a json of date parameters and write javascript turn that into Date objects or have go code which adjusts the template output. Please share a more elegant solution. Thank you.

You don't need to add a format function to the templates.

You can use your struct like so:

{{.Date.Format "Mon 2 Jan 2006"}}

The solution might be something like this:

var date = new Date(parseInt({{.Date.Nanosecond }} /1000));