newbie questions on calculating working days (date range minus weekends & holidays)

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It’s quite weird (frustrating) that <input type=date> gives you dates on UTC midnight as input.valueAsDate, rather than midnight local time. Thus, if you want to format the date as a string consistently with the input, you either need to convert it to local time or format it in UTC time.

For example, given a UTC date:

utc = new Date("2012-01-02")

To convert UTC to local time:

local = new Date(+utc + utc.getTimezoneOffset() * 1000 * 60)

This can then be formatted in local time:

local.toLocaleString(undefined, {month: "long", day: "numeric", year: "numeric"})

To format a UTC date in UTC time:

utc.toLocaleString(undefined, {timeZone: "utc", month: "long", day: "numeric", year: "numeric"})
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