The Code

                        
                            let currentElement = "";
                            let tasks = JSON.parse(localStorage.getItem("taskArray")) || [];
                            filteredTasks = tasks;
                            displayAllData(tasks);

                            function displayData(tasks) {
                                const template = document.getElementById("eventData-template");
                                const taskBody = document.getElementById("results");
                                taskBody.innerHTML = "";
                                let curtasks = JSON.parse(localStorage.getItem("taskArray")) || [];
                                let today3 = new Date();
                                for (let i = 0; i < curtasks.length; i++) { 
                                    if (curtasks[i].completed == 'no' ) { 
                                        const taskRows = document.importNode(template.content, true);
                                        let todayL = curtasks[i].dateDue;
                                        let today = todayL;
                                        let year = today.slice(2, 4);
                                        let month = today.slice(5, 7);
                                        let day = today.slice(8, 10);
                                        today = month + "/" + day + "/" + year;
                                        curtasks[i].dateDue = today;
                                        curtasks[i]["id"] = i;
                                        taskRows.getElementById("task").textContent = curtasks[i].task;
                                        taskRows.getElementById("dateCreated").textContent = curtasks[i].dateCreated;
                                        taskRows.getElementById("dateDue").textContent = curtasks[i].dateDue;
                                        taskRows.getElementById("links").setAttribute("data-string", curtasks[i].id);
                                        taskRows.getElementById("id").textContent = curtasks[i].id;
                                        taskBody.appendChild(taskRows);
                                        curtasks[i].dateDue = todayL;
                                    } else {
                                        const taskRows = document.importNode(template.content, true);
                                        let todayL = curtasks[i].dateDue;
                                        let today = todayL;
                                        let year = today.slice(2, 4);
                                        let month = today.slice(5, 7);
                                        let day = today.slice(8, 10);
                                        today = month + "/" + day + "/" + year;
                                        curtasks[i].dateDue = today;
                                        curtasks[i]["id"] = i;

                                        taskRows.getElementById("task").innerHTML = '' + curtasks[i].task;
                                        taskRows.getElementById("dateCreated").innerHTML = '' + curtasks[i].dateCreated;
                                        taskRows.getElementById("dateDue").innerHTML = '' + curtasks[i].dateDue;
                                        taskRows.getElementById("links").setAttribute("data-string", curtasks[i].id);
                                        taskRows.getElementById("id").textContent = curtasks[i].id;
                                        taskBody.appendChild(taskRows);
                                        curtasks[i].dateDue = todayL;
                                    }
                                }
                                localStorage.setItem("taskArray", JSON.stringify(curtasks));
                            }

                            function completeTask(task) {
                                let curtasks = JSON.parse(localStorage.getItem("taskArray"));
                                let taskId1 = task.parentNode;
                                let taskId2 = parseInt(taskId1.getAttribute("data-string"));

                                if (curtasks[taskId2].completed == "yes") {
                                    curtasks[taskId2].completed = "no";
                                } else {
                                    curtasks[taskId2].completed = "yes";
                                }
                                localStorage.setItem("taskArray", JSON.stringify(curtasks));
                                displayData();
                            }

                            function addData() {
                                let curtasks = JSON.parse(localStorage.getItem("taskArray"));
                                let dismissBtn = document.getElementById("dismissBtn");

                                if (curtasks == null) {
                                    curtasks = tasks;
                                }
                                let i = curtasks.length + 1;
                                let objTask = {};
                                objTask["task"] = document.getElementById("addTitle").value;
                                objTask["dateDue"] = document.getElementById("addDate").value;
                                let today = new Date();
                                let todayDate = (today.getMonth() + 1) + '/' + today.getDate() + '/' + today.getFullYear();
                                objTask["dateCreated"] = todayDate;
                                objTask["completed"] = "no";
                                objTask["id"] = i;

                                if (objTask["task"] == "" || objTask["dateDue"] == "Invalid Date") {
                                    Swal.fire({
                                        icon: 'error',
                                        title: 'Invalid',
                                        text: 'All fields must be entered!',
                                    })
                                    return;
                                } else {
                                    curtasks.push(objTask);
                                    localStorage.setItem("taskArray", JSON.stringify(curtasks));
                                    tasks = JSON.parse(localStorage.getItem("taskArray"));
                                    displayData(tasks);
                                    window.location.reload();
                                }
                                formClear();
                                dismissBtn.click();
                            }

                            function deleteTask(task) {
                                let curtasks = JSON.parse(localStorage.getItem("taskArray"));
                                let taskId1 = task.parentNode;
                                let taskId2 = parseInt(taskId1.getAttribute("data-string"));
                                curtasks.splice(taskId2, 1);
                                localStorage.setItem("taskArray", JSON.stringify(curtasks));
                                displayData();
                            }

                            function prepareEdit(task) {
                                let curtasks = JSON.parse(localStorage.getItem("taskArray")) || [];
                                let dismissBtn = document.getElementById("dismiss2Btn");
                                let taskId1 = task.parentNode;
                                let taskId2 = parseInt(taskId1.getAttribute("data-string"));
                                currentElement = taskId2;
                                document.getElementById("editTitle").value = curtasks[taskId2].task;
                                document.getElementById("editDate").value = curtasks[taskId2].dateDue;
                                dismissBtn.click();
                            }

                            function editTask() {

                                let curtasks = JSON.parse(localStorage.getItem("taskArray")) || [];
                                taskId2 = currentElement;
                                curtasks[taskId2]["task"] = document.getElementById("editTitle").value;
                                curtasks[taskId2]["dateDue"] = document.getElementById("editDate").value;
                                localStorage.setItem("taskArray", JSON.stringify(curtasks));
                                dismissBtn.click();
                                displayData();
                            }

                            function displayAllData() {
                                displayData(tasks);
                            }

                            function resetData() {
                                localStorage.clear();
                                window.location.reload();
                            }

                            function formClear() {
                                let theForm = document.getElementById("modalForm");
                                theForm.reset();
                            }