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1export function formatTime(date: Date) {
2  return date.toLocaleTimeString("en-US", {
3    hour: "numeric",
4    minute: "2-digit",
5    hour12: true,
6  });
7}
8
9export function formatDate(date: Date) {
10  return date.toLocaleDateString("en-US", {
11    weekday: "short",
12    month: "short",
13    day: "numeric",
14  });
15}
16
17export function formatTemperature(value: number | null | undefined) {
18  if (typeof value !== "number" || Number.isNaN(value)) return "--";
19  return `${Math.round(value)}°`;
20}
21
22export function formatDuration(seconds: number) {
23  const total = Math.max(Math.floor(seconds), 0);
24  const hours = Math.floor(total / 3600);
25  const minutes = Math.floor((total % 3600) / 60);
26
27  if (hours >= 24) {
28    const days = Math.floor(hours / 24);
29    return `${days}d ${hours % 24}h`;
30  }
31
32  if (hours > 0) {
33    return `${hours}h ${minutes}m`;
34  }
35
36  return `${minutes}m`;
37}
38
39export function safePercent(value: number | undefined) {
40  if (typeof value !== "number" || Number.isNaN(value)) return 0;
41  return Math.max(0, Math.min(Math.round(value), 100));
42}
43
44export function formatRelativeTime(isoTimestamp: string, now = new Date()) {
45  const target = new Date(isoTimestamp);
46  const deltaSeconds = Math.max(
47    Math.floor((now.getTime() - target.getTime()) / 1000),
48    0,
49  );
50
51  if (deltaSeconds < 60) return `${deltaSeconds}s ago`;
52  if (deltaSeconds < 3600) return `${Math.floor(deltaSeconds / 60)} min ago`;
53  if (deltaSeconds < 86_400) return `${Math.floor(deltaSeconds / 3600)}h ago`;
54  return `${Math.floor(deltaSeconds / 86_400)}d ago`;
55}
56