fix: 修复 formatDatetime 函数处理跨午夜时间显示问题

重构日期时间格式化逻辑，使用 dayjs 库替代字符串切片以提升健壮性。新增对跨午夜至 00:00 情况的特殊处理，将其显示为 24:00，使时间区间表达更符合日常习惯。

@@ -71,11 +71,31 @@ const strExist = (array, str) => {
   return exist.length > 0
 }
 
-const formatDatetime = (data) => { // 格式化日期
-  let begin_time = data?.begin_time.slice(0, -6);
-  let end_time = data?.end_time.slice(0, -6);
-  let str = begin_time + ' ' + end_time;
-  return `${str.split(' ')[0]} ${str.split(' ')[1]}-${str.split(' ')[3]}`;
+const formatDatetime = (data) => {
+  if (!data || !data.begin_time || !data.end_time) return '';
+
+  const normalize = (timeStr) => {
+    if (!timeStr) return '';
+    let clean = timeStr.split('+')[0];
+    clean = clean.split('Z')[0];
+    clean = clean.trim().replace(/\s+/, 'T');
+    return clean;
+  };
+
+  const start = dayjs(normalize(data.begin_time));
+  const end = dayjs(normalize(data.end_time));
+
+  if (!start.isValid() || !end.isValid()) return '';
+
+  const isNextDayMidnight =
+    end.diff(start, 'day') === 1 &&
+    end.hour() === 0 &&
+    end.minute() === 0 &&
+    end.second() === 0;
+
+  const endTimeText = isNextDayMidnight ? '24:00' : end.format('HH:mm');
+
+  return `${start.format('YYYY-MM-DD')} ${start.format('HH:mm')}-${endTimeText}`;
 }
 
 export { formatDate, wxInfo, hasEllipsis, parseQueryString, strExist, formatDatetime };