main.js

            });
        };
        CalendarApi.prototype.today = function () {
            var state = this.getCurrentData();
            this.unselect();
            this.dispatch({
                type: 'CHANGE_DATE',
                dateMarker: getNow(state.calendarOptions.now, state.dateEnv),
            });
        };
        CalendarApi.prototype.gotoDate = function (zonedDateInput) {
            var state = this.getCurrentData();
            this.unselect();
            this.dispatch({
                type: 'CHANGE_DATE',
                dateMarker: state.dateEnv.createMarker(zonedDateInput),
            });
        };
        CalendarApi.prototype.incrementDate = function (deltaInput) {
            var state = this.getCurrentData();
            var delta = createDuration(deltaInput);
            if (delta) { // else, warn about invalid input?
                this.unselect();
                this.dispatch({
                    type: 'CHANGE_DATE',
                    dateMarker: state.dateEnv.add(state.currentDate, delta),
                });
            }
        };
        // for external API
        CalendarApi.prototype.getDate = function () {
            var state = this.getCurrentData();
            return state.dateEnv.toDate(state.currentDate);
        };
        // Date Formatting Utils
        // -----------------------------------------------------------------------------------------------------------------
        CalendarApi.prototype.formatDate = function (d, formatter) {
            var dateEnv = this.getCurrentData().dateEnv;
            return dateEnv.format(dateEnv.createMarker(d), createFormatter(formatter));
        };
        // `settings` is for formatter AND isEndExclusive
        CalendarApi.prototype.formatRange = function (d0, d1, settings) {
            var dateEnv = this.getCurrentData().dateEnv;
            return dateEnv.formatRange(dateEnv.createMarker(d0), dateEnv.createMarker(d1), createFormatter(settings), settings);
        };
        CalendarApi.prototype.formatIso = function (d, omitTime) {
            var dateEnv = this.getCurrentData().dateEnv;
            return dateEnv.formatIso(dateEnv.createMarker(d), { omitTime: omitTime });
        };
        // Date Selection / Event Selection / DayClick
        // -----------------------------------------------------------------------------------------------------------------
        // this public method receives start/end dates in any format, with any timezone
        // NOTE: args were changed from v3
        CalendarApi.prototype.select = function (dateOrObj, endDate) {
            var selectionInput;
            if (endDate == null) {
                if (dateOrObj.start != null) {
                    selectionInput = dateOrObj;
                }
                else {
                    selectionInput = {
                        start: dateOrObj,
                        end: null,
                    };
                }
            }
            else {
                selectionInput = {
                    start: dateOrObj,
                    end: endDate,
                };
            }
            var state = this.getCurrentData();
            var selection = parseDateSpan(selectionInput, state.dateEnv, createDuration({ days: 1 }));
            if (selection) { // throw parse error otherwise?
                this.dispatch({ type: 'SELECT_DATES', selection: selection });
                triggerDateSelect(selection, null, state);
            }
        };
        // public method
        CalendarApi.prototype.unselect = function (pev) {
            var state = this.getCurrentData();
            if (state.dateSelection) {
                this.dispatch({ type: 'UNSELECT_DATES' });
                triggerDateUnselect(pev, state);
            }
        };
        // Public Events API
        // -----------------------------------------------------------------------------------------------------------------
        CalendarApi.prototype.addEvent = function (eventInput, sourceInput) {
            if (eventInput instanceof EventApi) {
                var def = eventInput._def;
                var instance = eventInput._instance;
                var currentData = this.getCurrentData();
                // not already present? don't want to add an old snapshot
                if (!currentData.eventStore.defs[def.defId]) {
                    this.dispatch({
                        type: 'ADD_EVENTS',
                        eventStore: eventTupleToStore({ def: def, instance: instance }),
                    });
                    this.triggerEventAdd(eventInput);
                }
                return eventInput;
            }
            var state = this.getCurrentData();
            var eventSource;
            if (sourceInput instanceof EventSourceApi) {
                eventSource = sourceInput.internalEventSource;
            }
            else if (typeof sourceInput === 'boolean') {
                if (sourceInput) { // true. part of the first event source
                    eventSource = hashValuesToArray(state.eventSources)[0];
                }
            }
            else if (sourceInput != null) { // an ID. accepts a number too
                var sourceApi = this.getEventSourceById(sourceInput); // TODO: use an internal function
                if (!sourceApi) {
                    console.warn("Could not find an event source with ID \"" + sourceInput + "\""); // TODO: test
                    return null;
                }
                eventSource = sourceApi.internalEventSource;
            }
            var tuple = parseEvent(eventInput, eventSource, state, false);
            if (tuple) {
                var newEventApi = new EventApi(state, tuple.def, tuple.def.recurringDef ? null : tuple.instance);
                this.dispatch({
                    type: 'ADD_EVENTS',
                    eventStore: eventTupleToStore(tuple),
                });
                this.triggerEventAdd(newEventApi);
                return newEventApi;
            }
            return null;
        };
        CalendarApi.prototype.triggerEventAdd = function (eventApi) {
            var _this = this;
            var emitter = this.getCurrentData().emitter;
            emitter.trigger('eventAdd', {
                event: eventApi,
                relatedEvents: [],
                revert: function () {
                    _this.dispatch({
                        type: 'REMOVE_EVENTS',
                        eventStore: eventApiToStore(eventApi),
                    });
                },
            });
        };
        // TODO: optimize
        CalendarApi.prototype.getEventById = function (id) {
            var state = this.getCurrentData();
            var _a = state.eventStore, defs = _a.defs, instances = _a.instances;
            id = String(id);
            for (var defId in defs) {
                var def = defs[defId];
                if (def.publicId === id) {
                    if (def.recurringDef) {
                        return new EventApi(state, def, null);
                    }
                    for (var instanceId in instances) {
                        var instance = instances[instanceId];
                        if (instance.defId === def.defId) {
                            return new EventApi(state, def, instance);
                        }
                    }
                }
            }
            return null;
        };
        CalendarApi.prototype.getEvents = function () {
            var currentData = this.getCurrentData();
            return buildEventApis(currentData.eventStore, currentData);
        };
        CalendarApi.prototype.removeAllEvents = function () {
            this.dispatch({ type: 'REMOVE_ALL_EVENTS' });
        };
        // Public Event Sources API
        // -----------------------------------------------------------------------------------------------------------------
        CalendarApi.prototype.getEventSources = function () {
            var state = this.getCurrentData();
            var sourceHash = state.eventSources;
            var sourceApis = [];
            for (var internalId in sourceHash) {
                sourceApis.push(new EventSourceApi(state, sourceHash[internalId]));
            }
            return sourceApis;
        };
        CalendarApi.prototype.getEventSourceById = function (id) {
            var state = this.getCurrentData();
            var sourceHash = state.eventSources;
            id = String(id);
            for (var sourceId in sourceHash) {
                if (sourceHash[sourceId].publicId === id) {
                    return new EventSourceApi(state, sourceHash[sourceId]);
                }
            }
            return null;
        };
        CalendarApi.prototype.addEventSource = function (sourceInput) {
            var state = this.getCurrentData();
            if (sourceInput instanceof EventSourceApi) {
                // not already present? don't want to add an old snapshot
                if (!state.eventSources[sourceInput.internalEventSource.sourceId]) {
                    this.dispatch({
                        type: 'ADD_EVENT_SOURCES',
                        sources: [sourceInput.internalEventSource],
                    });
                }
                return sourceInput;
            }
            var eventSource = parseEventSource(sourceInput, state);
            if (eventSource) { // TODO: error otherwise?
                this.dispatch({ type: 'ADD_EVENT_SOURCES', sources: [eventSource] });
                return new EventSourceApi(state, eventSource);
            }
            return null;
        };
        CalendarApi.prototype.removeAllEventSources = function () {
            this.dispatch({ type: 'REMOVE_ALL_EVENT_SOURCES' });
        };
        CalendarApi.prototype.refetchEvents = function () {
            this.dispatch({ type: 'FETCH_EVENT_SOURCES' });
        };
        // Scroll
        // -----------------------------------------------------------------------------------------------------------------
        CalendarApi.prototype.scrollToTime = function (timeInput) {
            var time = createDuration(timeInput);
            if (time) {
                this.trigger('_scrollRequest', { time: time });
            }
        };
        return CalendarApi;
    }());

    var EventApi = /** @class */ (function () {
        // instance will be null if expressing a recurring event that has no current instances,
        // OR if trying to validate an incoming external event that has no dates assigned
        function EventApi(context, def, instance) {
            this._context = context;
            this._def = def;
            this._instance = instance || null;
        }
        /*
        TODO: make event struct more responsible for this
        */
        EventApi.prototype.setProp = function (name, val) {
            var _a, _b;
            if (name in EVENT_DATE_REFINERS) {
                console.warn('Could not set date-related prop \'name\'. Use one of the date-related methods instead.');
            }
            else if (name in EVENT_NON_DATE_REFINERS) {
                val = EVENT_NON_DATE_REFINERS[name](val);
                this.mutate({
                    standardProps: (_a = {}, _a[name] = val, _a),
                });
            }
            else if (name in EVENT_UI_REFINERS) {
                var ui = EVENT_UI_REFINERS[name](val);
                if (name === 'color') {
                    ui = { backgroundColor: val, borderColor: val };
                }
                else if (name === 'editable') {
                    ui = { startEditable: val, durationEditable: val };
                }
                else {
                    ui = (_b = {}, _b[name] = val, _b);
                }
                this.mutate({
                    standardProps: { ui: ui },
                });
            }
            else {
                console.warn("Could not set prop '" + name + "'. Use setExtendedProp instead.");
            }
        };
        EventApi.prototype.setExtendedProp = function (name, val) {
            var _a;
            this.mutate({
                extendedProps: (_a = {}, _a[name] = val, _a),
            });
        };
        EventApi.prototype.setStart = function (startInput, options) {
            if (options === void 0) { options = {}; }
            var dateEnv = this._context.dateEnv;
            var start = dateEnv.createMarker(startInput);
            if (start && this._instance) { // TODO: warning if parsed bad
                var instanceRange = this._instance.range;
                var startDelta = diffDates(instanceRange.start, start, dateEnv, options.granularity); // what if parsed bad!?
                if (options.maintainDuration) {
                    this.mutate({ datesDelta: startDelta });
                }
                else {
                    this.mutate({ startDelta: startDelta });
                }
            }
        };
        EventApi.prototype.setEnd = function (endInput, options) {
            if (options === void 0) { options = {}; }
            var dateEnv = this._context.dateEnv;
            var end;
            if (endInput != null) {
                end = dateEnv.createMarker(endInput);
                if (!end) {
                    return; // TODO: warning if parsed bad
                }
            }
            if (this._instance) {
                if (end) {
                    var endDelta = diffDates(this._instance.range.end, end, dateEnv, options.granularity);
                    this.mutate({ endDelta: endDelta });
                }
                else {
                    this.mutate({ standardProps: { hasEnd: false } });
                }
            }
        };
        EventApi.prototype.setDates = function (startInput, endInput, options) {
            if (options === void 0) { options = {}; }
            var dateEnv = this._context.dateEnv;
            var standardProps = { allDay: options.allDay };
            var start = dateEnv.createMarker(startInput);
            var end;
            if (!start) {
                return; // TODO: warning if parsed bad
            }
            if (endInput != null) {
                end = dateEnv.createMarker(endInput);
                if (!end) { // TODO: warning if parsed bad
                    return;
                }
            }
            if (this._instance) {
                var instanceRange = this._instance.range;
                // when computing the diff for an event being converted to all-day,
                // compute diff off of the all-day values the way event-mutation does.
                if (options.allDay === true) {
                    instanceRange = computeAlignedDayRange(instanceRange);
                }
                var startDelta = diffDates(instanceRange.start, start, dateEnv, options.granularity);
                if (end) {
                    var endDelta = diffDates(instanceRange.end, end, dateEnv, options.granularity);
                    if (durationsEqual(startDelta, endDelta)) {
                        this.mutate({ datesDelta: startDelta, standardProps: standardProps });
                    }
                    else {
                        this.mutate({ startDelta: startDelta, endDelta: endDelta, standardProps: standardProps });
                    }
                }
                else { // means "clear the end"
                    standardProps.hasEnd = false;
                    this.mutate({ datesDelta: startDelta, standardProps: standardProps });
                }
            }
        };
        EventApi.prototype.moveStart = function (deltaInput) {
            var delta = createDuration(deltaInput);
            if (delta) { // TODO: warning if parsed bad
                this.mutate({ startDelta: delta });
            }
        };
        EventApi.prototype.moveEnd = function (deltaInput) {
            var delta = createDuration(deltaInput);
            if (delta) { // TODO: warning if parsed bad
                this.mutate({ endDelta: delta });
            }
        };
        EventApi.prototype.moveDates = function (deltaInput) {
            var delta = createDuration(deltaInput);
            if (delta) { // TODO: warning if parsed bad
                this.mutate({ datesDelta: delta });
            }
        };
        EventApi.prototype.setAllDay = function (allDay, options) {
            if (options === void 0) { options = {}; }
            var standardProps = { allDay: allDay };
            var maintainDuration = options.maintainDuration;
            if (maintainDuration == null) {
                maintainDuration = this._context.options.allDayMaintainDuration;
            }
            if (this._def.allDay !== allDay) {
                standardProps.hasEnd = maintainDuration;
            }
            this.mutate({ standardProps: standardProps });
        };
        EventApi.prototype.formatRange = function (formatInput) {
            var dateEnv = this._context.dateEnv;
            var instance = this._instance;
            var formatter = createFormatter(formatInput);
            if (this._def.hasEnd) {
                return dateEnv.formatRange(instance.range.start, instance.range.end, formatter, {
                    forcedStartTzo: instance.forcedStartTzo,
                    forcedEndTzo: instance.forcedEndTzo,
                });
            }
            return dateEnv.format(instance.range.start, formatter, {
                forcedTzo: instance.forcedStartTzo,
            });
        };
        EventApi.prototype.mutate = function (mutation) {
            var instance = this._instance;
            if (instance) {
                var def = this._def;
                var context_1 = this._context;
                var eventStore_1 = context_1.getCurrentData().eventStore;
                var relevantEvents = getRelevantEvents(eventStore_1, instance.instanceId);
                var eventConfigBase = {
                    '': {
                        display: '',
                        startEditable: true,
                        durationEditable: true,
                        constraints: [],
                        overlap: null,
                        allows: [],
                        backgroundColor: '',
                        borderColor: '',
                        textColor: '',
                        classNames: [],
                    },
                };
                relevantEvents = applyMutationToEventStore(relevantEvents, eventConfigBase, mutation, context_1);
                var oldEvent = new EventApi(context_1, def, instance); // snapshot
                this._def = relevantEvents.defs[def.defId];
                this._instance = relevantEvents.instances[instance.instanceId];
                context_1.dispatch({
                    type: 'MERGE_EVENTS',
                    eventStore: relevantEvents,
                });
                context_1.emitter.trigger('eventChange', {
                    oldEvent: oldEvent,
                    event: this,
                    relatedEvents: buildEventApis(relevantEvents, context_1, instance),
                    revert: function () {
                        context_1.dispatch({
                            type: 'RESET_EVENTS',
                            eventStore: eventStore_1,
                        });
                    },
                });
            }
        };
        EventApi.prototype.remove = function () {
            var context = this._context;
            var asStore = eventApiToStore(this);
            context.dispatch({
                type: 'REMOVE_EVENTS',
                eventStore: asStore,
            });
            context.emitter.trigger('eventRemove', {
                event: this,
                relatedEvents: [],
                revert: function () {
                    context.dispatch({
                        type: 'MERGE_EVENTS',
                        eventStore: asStore,
                    });
                },
            });
        };
        Object.defineProperty(EventApi.prototype, "source", {
            get: function () {
                var sourceId = this._def.sourceId;
                if (sourceId) {
                    return new EventSourceApi(this._context, this._context.getCurrentData().eventSources[sourceId]);
                }
                return null;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "start", {
            get: function () {
                return this._instance ?
                    this._context.dateEnv.toDate(this._instance.range.start) :
                    null;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "end", {
            get: function () {
                return (this._instance && this._def.hasEnd) ?
                    this._context.dateEnv.toDate(this._instance.range.end) :
                    null;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "startStr", {
            get: function () {
                var instance = this._instance;
                if (instance) {
                    return this._context.dateEnv.formatIso(instance.range.start, {
                        omitTime: this._def.allDay,
                        forcedTzo: instance.forcedStartTzo,
                    });
                }
                return '';
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "endStr", {
            get: function () {
                var instance = this._instance;
                if (instance && this._def.hasEnd) {
                    return this._context.dateEnv.formatIso(instance.range.end, {
                        omitTime: this._def.allDay,
                        forcedTzo: instance.forcedEndTzo,
                    });
                }
                return '';
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "id", {
            // computable props that all access the def
            // TODO: find a TypeScript-compatible way to do this at scale
            get: function () { return this._def.publicId; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "groupId", {
            get: function () { return this._def.groupId; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "allDay", {
            get: function () { return this._def.allDay; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "title", {
            get: function () { return this._def.title; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "url", {
            get: function () { return this._def.url; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "display", {
            get: function () { return this._def.ui.display || 'auto'; } // bad. just normalize the type earlier
            ,
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "startEditable", {
            get: function () { return this._def.ui.startEditable; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "durationEditable", {
            get: function () { return this._def.ui.durationEditable; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "constraint", {
            get: function () { return this._def.ui.constraints[0] || null; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "overlap", {
            get: function () { return this._def.ui.overlap; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "allow", {
            get: function () { return this._def.ui.allows[0] || null; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "backgroundColor", {
            get: function () { return this._def.ui.backgroundColor; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "borderColor", {
            get: function () { return this._def.ui.borderColor; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "textColor", {
            get: function () { return this._def.ui.textColor; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "classNames", {
            // NOTE: user can't modify these because Object.freeze was called in event-def parsing
            get: function () { return this._def.ui.classNames; },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(EventApi.prototype, "extendedProps", {
            get: function () { return this._def.extendedProps; },
            enumerable: false,
            configurable: true
        });
        EventApi.prototype.toPlainObject = function (settings) {
            if (settings === void 0) { settings = {}; }
            var def = this._def;
            var ui = def.ui;
            var _a = this, startStr = _a.startStr, endStr = _a.endStr;
            var res = {};
            if (def.title) {
                res.title = def.title;
            }
            if (startStr) {
                res.start = startStr;
            }
            if (endStr) {
                res.end = endStr;
            }
            if (def.publicId) {
                res.id = def.publicId;
            }
            if (def.groupId) {
                res.groupId = def.groupId;
            }
            if (def.url) {
                res.url = def.url;
            }
            if (ui.display && ui.display !== 'auto') {
                res.display = ui.display;
            }
            // TODO: what about recurring-event properties???
            // TODO: include startEditable/durationEditable/constraint/overlap/allow
            if (settings.collapseColor && ui.backgroundColor && ui.backgroundColor === ui.borderColor) {
                res.color = ui.backgroundColor;
            }
            else {
                if (ui.backgroundColor) {
                    res.backgroundColor = ui.backgroundColor;
                }
                if (ui.borderColor) {
                    res.borderColor = ui.borderColor;
                }
            }
            if (ui.textColor) {
                res.textColor = ui.textColor;
            }
            if (ui.classNames.length) {
                res.classNames = ui.classNames;
            }
            if (Object.keys(def.extendedProps).length) {
                if (settings.collapseExtendedProps) {
                    __assign(res, def.extendedProps);
                }
                else {
                    res.extendedProps = def.extendedProps;
                }
            }
            return res;
        };
        EventApi.prototype.toJSON = function () {
            return this.toPlainObject();
        };
        return EventApi;
    }());
    function eventApiToStore(eventApi) {
        var _a, _b;
        var def = eventApi._def;
        var instance = eventApi._instance;
        return {
            defs: (_a = {}, _a[def.defId] = def, _a),
            instances: instance
                ? (_b = {}, _b[instance.instanceId] = instance, _b) : {},
        };
    }
    function buildEventApis(eventStore, context, excludeInstance) {
        var defs = eventStore.defs, instances = eventStore.instances;
        var eventApis = [];
        var excludeInstanceId = excludeInstance ? excludeInstance.instanceId : '';
        for (var id in instances) {
            var instance = instances[id];
            var def = defs[instance.defId];
            if (instance.instanceId !== excludeInstanceId) {
                eventApis.push(new EventApi(context, def, instance));
            }
        }
        return eventApis;
    }

    var calendarSystemClassMap = {};
    function registerCalendarSystem(name, theClass) {
        calendarSystemClassMap[name] = theClass;
    }
    function createCalendarSystem(name) {
        return new calendarSystemClassMap[name]();
    }
    var GregorianCalendarSystem = /** @class */ (function () {
        function GregorianCalendarSystem() {
        }
        GregorianCalendarSystem.prototype.getMarkerYear = function (d) {
            return d.getUTCFullYear();
        };
        GregorianCalendarSystem.prototype.getMarkerMonth = function (d) {
            return d.getUTCMonth();
        };
        GregorianCalendarSystem.prototype.getMarkerDay = function (d) {
            return d.getUTCDate();
        };
        GregorianCalendarSystem.prototype.arrayToMarker = function (arr) {
            return arrayToUtcDate(arr);
        };
        GregorianCalendarSystem.prototype.markerToArray = function (marker) {
            return dateToUtcArray(marker);
        };
        return GregorianCalendarSystem;
    }());
    registerCalendarSystem('gregory', GregorianCalendarSystem);

    var ISO_RE = /^\s*(\d{4})(-?(\d{2})(-?(\d{2})([T ](\d{2}):?(\d{2})(:?(\d{2})(\.(\d+))?)?(Z|(([-+])(\d{2})(:?(\d{2}))?))?)?)?)?$/;
    function parse(str) {
        var m = ISO_RE.exec(str);
        if (m) {
            var marker = new Date(Date.UTC(Number(m[1]), m[3] ? Number(m[3]) - 1 : 0, Number(m[5] || 1), Number(m[7] || 0), Number(m[8] || 0), Number(m[10] || 0), m[12] ? Number("0." + m[12]) * 1000 : 0));
            if (isValidDate(marker)) {
                var timeZoneOffset = null;
                if (m[13]) {
                    timeZoneOffset = (m[15] === '-' ? -1 : 1) * (Number(m[16] || 0) * 60 +
                        Number(m[18] || 0));
                }
                return {
                    marker: marker,
                    isTimeUnspecified: !m[6],
                    timeZoneOffset: timeZoneOffset,
                };
            }
        }
        return null;
    }

    var DateEnv = /** @class */ (function () {
        function DateEnv(settings) {
            var timeZone = this.timeZone = settings.timeZone;
            var isNamedTimeZone = timeZone !== 'local' && timeZone !== 'UTC';
            if (settings.namedTimeZoneImpl && isNamedTimeZone) {
                this.namedTimeZoneImpl = new settings.namedTimeZoneImpl(timeZone);
            }
            this.canComputeOffset = Boolean(!isNamedTimeZone || this.namedTimeZoneImpl);
            this.calendarSystem = createCalendarSystem(settings.calendarSystem);
            this.locale = settings.locale;
            this.weekDow = settings.locale.week.dow;
            this.weekDoy = settings.locale.week.doy;
            if (settings.weekNumberCalculation === 'ISO') {
                this.weekDow = 1;
                this.weekDoy = 4;
            }
            if (typeof settings.firstDay === 'number') {
                this.weekDow = settings.firstDay;
            }
            if (typeof settings.weekNumberCalculation === 'function') {
                this.weekNumberFunc = settings.weekNumberCalculation;
            }
            this.weekText = settings.weekText != null ? settings.weekText : settings.locale.options.weekText;
            this.cmdFormatter = settings.cmdFormatter;
            this.defaultSeparator = settings.defaultSeparator;
        }
        // Creating / Parsing
        DateEnv.prototype.createMarker = function (input) {
            var meta = this.createMarkerMeta(input);
            if (meta === null) {
                return null;
            }
            return meta.marker;
        };
        DateEnv.prototype.createNowMarker = function () {
            if (this.canComputeOffset) {
                return this.timestampToMarker(new Date().valueOf());
            }
            // if we can't compute the current date val for a timezone,
            // better to give the current local date vals than UTC
            return arrayToUtcDate(dateToLocalArray(new Date()));
        };
        DateEnv.prototype.createMarkerMeta = function (input) {
            if (typeof input === 'string') {
                return this.parse(input);
            }
            var marker = null;
            if (typeof input === 'number') {
                marker = this.timestampToMarker(input);
            }
            else if (input instanceof Date) {
                input = input.valueOf();
                if (!isNaN(input)) {
                    marker = this.timestampToMarker(input);
                }
            }
            else if (Array.isArray(input)) {
                marker = arrayToUtcDate(input);
            }
            if (marker === null || !isValidDate(marker)) {
                return null;
            }
            return { marker: marker, isTimeUnspecified: false, forcedTzo: null };
        };
        DateEnv.prototype.parse = function (s) {
            var parts = parse(s);
            if (parts === null) {
                return null;
            }
            var marker = parts.marker;
            var forcedTzo = null;
            if (parts.timeZoneOffset !== null) {
                if (this.canComputeOffset) {
                    marker = this.timestampToMarker(marker.valueOf() - parts.timeZoneOffset * 60 * 1000);
                }
                else {
                    forcedTzo = parts.timeZoneOffset;
                }
            }
            return { marker: marker, isTimeUnspecified: parts.isTimeUnspecified, forcedTzo: forcedTzo };
        };
        // Accessors
        DateEnv.prototype.getYear = function (marker) {
            return this.calendarSystem.getMarkerYear(marker);
        };
        DateEnv.prototype.getMonth = function (marker) {
            return this.calendarSystem.getMarkerMonth(marker);
        };
        // Adding / Subtracting
        DateEnv.prototype.add = function (marker, dur) {
            var a = this.calendarSystem.markerToArray(marker);
            a[0] += dur.years;
            a[1] += dur.months;
            a[2] += dur.days;
            a[6] += dur.milliseconds;
            return this.calendarSystem.arrayToMarker(a);
        };
        DateEnv.prototype.subtract = function (marker, dur) {
            var a = this.calendarSystem.markerToArray(marker);
            a[0] -= dur.years;
            a[1] -= dur.months;
            a[2] -= dur.days;
            a[6] -= dur.milliseconds;
            return this.calendarSystem.arrayToMarker(a);
        };
        DateEnv.prototype.addYears = function (marker, n) {
            var a = this.calendarSystem.markerToArray(marker);
            a[0] += n;
            return this.calendarSystem.arrayToMarker(a);
        };
        DateEnv.prototype.addMonths = function (marker, n) {
            var a = this.calendarSystem.markerToArray(marker);
            a[1] += n;
            return this.calendarSystem.arrayToMarker(a);
        };
        // Diffing Whole Units
        DateEnv.prototype.diffWholeYears = function (m0, m1) {
            var calendarSystem = this.calendarSystem;
            if (timeAsMs(m0) === timeAsMs(m1) &&
                calendarSystem.getMarkerDay(m0) === calendarSystem.getMarkerDay(m1) &&
                calendarSystem.getMarkerMonth(m0) === calendarSystem.getMarkerMonth(m1)) {
                return calendarSystem.getMarkerYear(m1) - calendarSystem.getMarkerYear(m0);
            }
            return null;
        };
        DateEnv.prototype.diffWholeMonths = function (m0, m1) {
            var calendarSystem = this.calendarSystem;
            if (timeAsMs(m0) === timeAsMs(m1) &&
                calendarSystem.getMarkerDay(m0) === calendarSystem.getMarkerDay(m1)) {
                return (calendarSystem.getMarkerMonth(m1) - calendarSystem.getMarkerMonth(m0)) +
                    (calendarSystem.getMarkerYear(m1) - calendarSystem.getMarkerYear(m0)) * 12;
            }
            return null;
        };
        // Range / Duration
        DateEnv.prototype.greatestWholeUnit = function (m0, m1) {
            var n = this.diffWholeYears(m0, m1);
            if (n !== null) {
                return { unit: 'year', value: n };
            }
            n = this.diffWholeMonths(m0, m1);
            if (n !== null) {
                return { unit: 'month', value: n };
            }
            n = diffWholeWeeks(m0, m1);
            if (n !== null) {
                return { unit: 'week', value: n };
            }
            n = diffWholeDays(m0, m1);
            if (n !== null) {
                return { unit: 'day', value: n };
            }
            n = diffHours(m0, m1);
            if (isInt(n)) {
                return { unit: 'hour', value: n };
            }
            n = diffMinutes(m0, m1);
            if (isInt(n)) {
                return { unit: 'minute', value: n };
            }
            n = diffSeconds(m0, m1);
            if (isInt(n)) {
                return { unit: 'second', value: n };
            }
            return { unit: 'millisecond', value: m1.valueOf() - m0.valueOf() };
        };
        DateEnv.prototype.countDurationsBetween = function (m0, m1, d) {
            // TODO: can use greatestWholeUnit
            var diff;
            if (d.years) {
                diff = this.diffWholeYears(m0, m1);
                if (diff !== null) {
                    return diff / asRoughYears(d);
                }
            }
            if (d.months) {
                diff = this.diffWholeMonths(m0, m1);
                if (diff !== null) {
                    return diff / asRoughMonths(d);
                }
            }
            if (d.days) {
                diff = diffWholeDays(m0, m1);
                if (diff !== null) {
                    return diff / asRoughDays(d);
                }
            }
            return (m1.valueOf() - m0.valueOf()) / asRoughMs(d);
        };
        // Start-Of
        // these DON'T return zoned-dates. only UTC start-of dates
        DateEnv.prototype.startOf = function (m, unit) {
            if (unit === 'year') {
                return this.startOfYear(m);
            }
            if (unit === 'month') {
                return this.startOfMonth(m);
            }
            if (unit === 'week') {
                return this.startOfWeek(m);
            }
            if (unit === 'day') {
                return startOfDay(m);
            }
            if (unit === 'hour') {
                return startOfHour(m);
            }
            if (unit === 'minute') {
                return startOfMinute(m);
            }
            if (unit === 'second') {
                return startOfSecond(m);
            }
            return null;
        };
        DateEnv.prototype.startOfYear = function (m) {
            return this.calendarSystem.arrayToMarker([
                this.calendarSystem.getMarkerYear(m),
            ]);
        };
        DateEnv.prototype.startOfMonth = function (m) {
            return this.calendarSystem.arrayToMarker([
                this.calendarSystem.getMarkerYear(m),
                this.calendarSystem.getMarkerMonth(m),
            ]);
        };
        DateEnv.prototype.startOfWeek = function (m) {
            return this.calendarSystem.arrayToMarker([
                this.calendarSystem.getMarkerYear(m),
                this.calendarSystem.getMarkerMonth(m),
                m.getUTCDate() - ((m.getUTCDay() - this.weekDow + 7) % 7),
            ]);
        };
        // Week Number
        DateEnv.prototype.computeWeekNumber = function (marker) {
            if (this.weekNumberFunc) {
                return this.weekNumberFunc(this.toDate(marker));
            }
            return weekOfYear(marker, this.weekDow, this.weekDoy);
        };
        // TODO: choke on timeZoneName: long
        DateEnv.prototype.format = function (marker, formatter, dateOptions) {
            if (dateOptions === void 0) { dateOptions = {}; }
            return formatter.format({
                marker: marker,
                timeZoneOffset: dateOptions.forcedTzo != null ?
                    dateOptions.forcedTzo :
                    this.offsetForMarker(marker),
            }, this);
        };
        DateEnv.prototype.formatRange = function (start, end, formatter, dateOptions) {
            if (dateOptions === void 0) { dateOptions = {}; }
            if (dateOptions.isEndExclusive) {
                end = addMs(end, -1);
            }
            return formatter.formatRange({
                marker: start,
                timeZoneOffset: dateOptions.forcedStartTzo != null ?
                    dateOptions.forcedStartTzo :
                    this.offsetForMarker(start),
            }, {
                marker: end,
                timeZoneOffset: dateOptions.forcedEndTzo != null ?
                    dateOptions.forcedEndTzo :
                    this.offsetForMarker(end),
            }, this, dateOptions.defaultSeparator);