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/*
Some hours don't exist in local time when a daylight-savings shift happpens.
This time is called a "dead zone".
If possible, this function returns an array of two dates,
the date just before the dead zone (with a 999 millisecond time)
and the date just after the dead zone.
I apologize for the unreadability of this code. It was written a long time ago:
https://github.com/arshaw/xdate/blob/master/test/old.js
*/
export function getDSTDeadZone() {
var dstDates = getDSTDates()
if (dstDates) {
var prior = new Date(dstDates[0].valueOf() - 1)
if (Math.abs(dstDates[0].getHours() - prior.getHours()) > 1) {
return [prior, dstDates[0]]
}
prior = new Date(dstDates[1].valueOf() - 1)
if (Math.abs(dstDates[1].getHours() - prior.getHours()) > 1) {
return [prior, dstDates[1]]
}
}
}
function getDSTDates() {
var MS_DAY = 86400000
var res = []
var d0 = new Date()
var overAYear = new Date(+d0)
overAYear.setFullYear(overAYear.getFullYear() + 1)
overAYear = new Date(overAYear.valueOf() + MS_DAY)
while (d0 < overAYear) {
var d1 = new Date(d0.valueOf() + MS_DAY)
if (d0.getTimezoneOffset() !== d1.getTimezoneOffset()) {
res.push(new Date(narrowDSTDate(+d0, +d1)))
if (res.length === 2) {
break
}
}
d0 = d1
}
return res.length === 2 ? res : null
}
function narrowDSTDate(start, end) {
if (end <= start + 1) {
return end
}
var mid = start + Math.floor((end - start) / 2)
var midTZO = new Date(mid).getTimezoneOffset()
var startTZO = new Date(start).getTimezoneOffset()
var endTZO = new Date(end).getTimezoneOffset()
if (midTZO === startTZO) {
return narrowDSTDate(mid, end)
} else if (midTZO === endTZO) {
return narrowDSTDate(start, mid)
}
}