first commit

src/utils/dateUtils.js

@@ -0,0 +1,60 @@
+function addMonthsToDate(dateString, monthsToAdd) {
+    const date = new Date(dateString);
+    date.setMonth(date.getMonth() + monthsToAdd);
+    date.setDate(date.getDate() - 1);
+    return formatDate(date);
+}
+
+function dateFormatter(dateString) {
+    if (!dateString || !/^\d{4}-\d{2}-\d{2}$/.test(dateString)) return "날짜 형식 오류";
+    const [year, month, day] = dateString.split('-');
+    return `${year}년 ${month}월 ${day}일`;
+}
+
+function calculateDaysFromNow(dateString, now = new Date()) {
+    const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+    today.setHours(0,0,0,0);
+    const inputDate = new Date(dateString);
+    inputDate.setHours(0,0,0,0);
+    return Math.ceil((inputDate.getTime() - today.getTime()) / 86400000);
+}
+
+function calculateDateDifference(date1Str, date2Str) {
+    const d1 = new Date(date1Str);
+    d1.setHours(0, 0, 0, 0);
+    const d2 = new Date(date2Str);
+    d2.setHours(0, 0, 0, 0);
+    return Math.ceil(Math.abs(d2.getTime() - d1.getTime()) / 86400000);
+}
+
+function calculateProgress(startDateStr, endDateStr, now = new Date()) {
+    const start = new Date(startDateStr);
+    start.setHours(0, 0, 0, 0);
+    const end = new Date(endDateStr);
+    end.setHours(0, 0, 0, 0);
+    const currentTime = now.getTime();
+    if (start.getTime() >= end.getTime() || currentTime >= end.getTime()) return '100.0000000';
+    if (currentTime <= start.getTime()) return 0;
+    return Math.max(0, Math.min(100, ((currentTime - start.getTime()) / (end.getTime() - start.getTime())) * 100));
+}
+
+function calculateMonthDifference(sYear, sMonth, eYear, eMonth) {
+    return (Number(eYear) - Number(sYear)) * 12 + (Number(eMonth) - Number(sMonth));
+}
+
+function formatDate(date) {
+    const year = date.getFullYear();
+    const month = String(date.getMonth() + 1).padStart(2, '0');
+    const day = String(date.getDate()).padStart(2, '0');
+    return `${year}-${month}-${day}`;
+}
+
+module.exports = {
+    addMonthsToDate,
+    dateFormatter,
+    calculateDaysFromNow,
+    calculateDateDifference,
+    calculateProgress,
+    calculateMonthDifference,
+    formatDate
+};