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chore: import upstream snapshot with attribution
2026-07-13 13:00:43 +08:00

52 lines
1.8 KiB
TypeScript

/**
* Shared locale-aware time helpers for sidebar / session lists.
*
* Two pieces:
*
* 1. `getDayGroupKey(ts)` — returns a stable token (`today` / `yesterday` /
* `last_7_days` / `earlier`) for grouping. Callers map that token to a
* translated label via i18next so the same grouping logic works across
* locales.
*
* 2. `formatRelativeTime(ts, locale)` — wraps `Intl.RelativeTimeFormat` with
* the caller's active locale instead of the previously-hardcoded `"en"`.
* Falls back to `"en"` on unsupported locales to match Intl's own
* behaviour rather than throwing.
*/
export type DayGroupKey = "today" | "yesterday" | "last_7_days" | "earlier";
export function getDayGroupKey(timestamp: number): DayGroupKey {
const now = new Date();
const date = new Date(timestamp * 1000);
const startOfToday = new Date(
now.getFullYear(),
now.getMonth(),
now.getDate(),
).getTime();
const startOfItemDay = new Date(
date.getFullYear(),
date.getMonth(),
date.getDate(),
).getTime();
const diffDays = Math.floor((startOfToday - startOfItemDay) / 86400000);
if (diffDays <= 0) return "today";
if (diffDays === 1) return "yesterday";
if (diffDays < 7) return "last_7_days";
return "earlier";
}
export function formatRelativeTime(timestamp: number, locale: string): string {
const diffSeconds = Math.round(timestamp - Date.now() / 1000);
const formatter = new Intl.RelativeTimeFormat(locale || "en", {
numeric: "auto",
});
const abs = Math.abs(diffSeconds);
if (abs < 60) return formatter.format(diffSeconds, "second");
if (abs < 3600)
return formatter.format(Math.round(diffSeconds / 60), "minute");
if (abs < 86400)
return formatter.format(Math.round(diffSeconds / 3600), "hour");
return formatter.format(Math.round(diffSeconds / 86400), "day");
}