pithu

import java.time.*
// import org.threeten.bp.*

def data_dst_samples = [
        // overlap
        ['2017-11-05T01:00:00-07:00[America/Los_Angeles]', '2017-11-05T08:00:00Z'],
        ['2017-11-05T01:00:00-08:00[America/Los_Angeles]', '2017-11-05T08:00:00Z'],
        ['2017-11-05T02:00:00-08:00[America/Los_Angeles]', '2017-11-05T10:00:00Z'],

        ['2016-11-06T01:00-04:00[America/New_York]', '2016-11-06T05:00:00Z'],

pithu

import {LocalDate, DayOfWeek, TemporalAdjusters, Instant, ZoneId, ZoneOffset, ZonedDateTime, LocalTime} from 'js-joda'
import {tz} from 'moment-timezone'

class MomentZoneRules {
    constructor(tz) {
        this.untils = tz.untils;
        // localUntils is an array taken from original utc untils, modified by the reverse of the maximum (of actual, previous) offset
        // thus, if you take the epochMillis of a LocalDateTime interpreted at UTC and binsearch it here,
        // you should find the index of the transition, that is either unique or is before the transition in case of gap/overlap
        this.localUntils = tz.untils.map((v, i) => v - Math.min(tz.offsets[i], tz.offsets[Math.max(0, i - 1)]) * 60000);