function show_calendar(oInputName, dataHoje) {

    const jPrincipal = getPrincipal();
    const bodyArea = jPrincipal.document.getElementById("_bodyArea");
    var oInput = document.getElementById(oInputName);

    if (oInput && !oInput.readOnly && !oInput.getAttribute("disabled")) {

        if (oInput._flatpickr) {
            const inst = oInput._flatpickr;

            if (inst._customListeners?.timeout) {
                clearTimeout(inst._customListeners.timeout);
                inst._customListeners.timeout = null;
            }

            inst.open();
            return;
        }

        const _flatpickr = window.flatpickr;
        if (!_flatpickr) return;

        function posicionarCalendario(instance) {
            const cal = instance.calendarContainer;
            const oIpt = document.getElementById(oInputName);
            const cIndex = getIndex();

            cal.style.visibility = "hidden";

            function aplicarPosicao() {
                const scrollTop = $("#_divScroll").scrollTop() || 0;
                const scrollLeft = $("#_divScroll").scrollLeft() || 0;

                const baseY = getTopVlr(oIpt) + oIpt.offsetHeight - scrollTop;
                const baseX = getLeftVlr(oIpt) - scrollLeft;

                const rect = cal.getBoundingClientRect();
                const width = rect.width || cal.offsetWidth;
                const height = rect.height || cal.offsetHeight;

                if (width === 0 || height === 0) {
                    setTimeout(aplicarPosicao, 30);
                    return;
                }

                const maxX = jPrincipal.getInnerWidth() - width;
                const maxY = jPrincipal.getInnerHeight() - height;

                let x = Math.max(0, Math.min(baseX, maxX));
                let y = baseY;

                if (y > maxY) y = baseY - oIpt.offsetHeight - height;
                y = Math.max(0, Math.min(y, maxY));

                cal.style.position = "fixed";
                cal.style.top = `${y}px`;
                cal.style.left = `${x}px`;
                cal.style.zIndex = String(1240 * cIndex + 2);
                cal.style.visibility = "visible";
            }

            setTimeout(() => requestAnimationFrame(aplicarPosicao), 30);
        }

        const fp = _flatpickr(oInput, {
            allowInput: true,
            clickOpens: false,
            disableMobile: true,
            static: false,
            dateFormat: "d/m/Y",
            locale: "pt",
            appendTo: bodyArea,

            onReady: function(selectedDates, dateStr, instance) {
                const cal = instance.calendarContainer;
                let interagindoInterno = false;

                instance._customListeners = instance._customListeners || {};
                instance._customListeners.timeout = null;

                function cancelarFechamento() {
                    if (instance._customListeners?.timeout) {
                        clearTimeout(instance._customListeners.timeout);
                        instance._customListeners.timeout = null;
                    }
                }

                function agendarFechamento(e) {
                    const destino = e.relatedTarget;
                    if (interagindoInterno) return;

                    if (destino && (
                        cal.contains(destino) ||
                        destino.closest(".flatpickr-calendar") ||
                        destino.closest(".flatpickr-monthDropdown-months") ||
                        destino.closest(".numInputWrapper")
                    )) return;

                    cancelarFechamento();
                    instance._customListeners.timeout = setTimeout(() => {
                        instance._customListeners.timeout = null;
                        instance.close();
                    }, 300);
                }

                function onMouseDown() {
                    interagindoInterno = true;
                    cancelarFechamento();
                }

                function onMouseUp() {
                    setTimeout(() => {
                        interagindoInterno = false;
                    }, 300);
                }

                cal.addEventListener("mousedown", onMouseDown);
                cal.addEventListener("mouseup", onMouseUp);
                cal.addEventListener("mouseenter", cancelarFechamento);
                cal.addEventListener("mouseleave", agendarFechamento);

                oInput.addEventListener("mouseenter", cancelarFechamento);
                oInput.addEventListener("mouseleave", agendarFechamento);

                instance._customListeners.cal = cal;
                instance._customListeners.oInput = oInput;
                instance._customListeners.onMouseDown = onMouseDown;
                instance._customListeners.onMouseUp = onMouseUp;
                instance._customListeners.cancelarFechamento = cancelarFechamento;
                instance._customListeners.agendarFechamento = agendarFechamento;
            },

            onOpen: function(selectedDates, dateStr, instance) {
                if (instance._customListeners?.timeout) {
                    clearTimeout(instance._customListeners.timeout);
                    instance._customListeners.timeout = null;
                }
                posicionarCalendario(instance);
            },

            onDestroy: function(_, __, instance) {
                const l = instance._customListeners;
                if (!l) return;

                if (l.timeout) clearTimeout(l.timeout);

                l.cal.removeEventListener("mousedown", l.onMouseDown);
                l.cal.removeEventListener("mouseup", l.onMouseUp);
                l.cal.removeEventListener("mouseenter", l.cancelarFechamento);
                l.cal.removeEventListener("mouseleave", l.agendarFechamento);

                l.oInput.removeEventListener("mouseenter", l.cancelarFechamento);
                l.oInput.removeEventListener("mouseleave", l.agendarFechamento);

                delete instance._customListeners;
            }
        });

        if (fp && typeof fp.open === "function") fp.open();
    }
}