feat: add bgp observability and admin ui improvements

frontend/src/utils/datetime.ts

@@ -0,0 +1,47 @@
+export function parseBackendDate(value: string | null | undefined): Date | null {
+  if (!value) return null
+
+  let normalized = value.trim()
+  if (!normalized) return null
+
+  if (normalized.includes(' ') && !normalized.includes('T')) {
+    normalized = normalized.replace(' ', 'T')
+  }
+
+  const hasTimezone = /(?:Z|[+-]\d{2}:\d{2})$/.test(normalized)
+  if (!hasTimezone) {
+    normalized = `${normalized}Z`
+  }
+
+  const date = new Date(normalized)
+  return Number.isNaN(date.getTime()) ? null : date
+}
+
+function padNumber(value: number): string {
+  return String(value).padStart(2, '0')
+}
+
+export function formatDateTimeZhCN(value: string | null | undefined): string {
+  const date = parseBackendDate(value)
+  if (!date) return '-'
+
+  const year = date.getFullYear()
+  const month = padNumber(date.getMonth() + 1)
+  const day = padNumber(date.getDate())
+  const hours = padNumber(date.getHours())
+  const minutes = padNumber(date.getMinutes())
+  const seconds = padNumber(date.getSeconds())
+
+  return `${year}/${month}/${day} ${hours}:${minutes}:${seconds}`
+}
+
+export function formatDateZhCN(value: string | null | undefined): string {
+  const date = parseBackendDate(value)
+  if (!date) return '-'
+
+  const year = date.getFullYear()
+  const month = padNumber(date.getMonth() + 1)
+  const day = padNumber(date.getDate())
+
+  return `${year}/${month}/${day}`
+}