feat: add datetime utils

src/utils/datetime.ts

@@ -0,0 +1,41 @@
+export function dateFormat(opts: {
+  date: string | Date | null;
+  locale?: string;
+  dayStyle?: "numeric" | "2-digit";
+  monthStyle?: "numeric" | "2-digit" | "long" | "short";
+  timeStyle?: "full" | "long" | "medium" | "short";
+  timeOnly?: boolean;
+  noDay?: boolean;
+  noMonth?: boolean;
+  noYear?: boolean;
+  withTime?: boolean;
+}): string {
+  const dt = opts.date ? new Date(opts.date) : new Date();
+
+  if (opts.timeOnly) {
+    opts.noDay = true;
+    opts.noMonth = true;
+    opts.noYear = true;
+    opts.timeStyle = opts.timeStyle || "short";
+  }
+
+  let timeText = opts.withTime
+    ? " " +
+      dateFormat({
+        date: opts.date,
+        timeOnly: true,
+        timeStyle: opts.timeStyle,
+      })
+    : "";
+
+  if (timeText) opts.timeStyle = undefined;
+
+  let formatted = new Intl.DateTimeFormat(opts.locale, {
+    day: opts.noDay ? undefined : opts.dayStyle || "numeric",
+    month: opts.noMonth ? undefined : opts.monthStyle || "short",
+    timeStyle: opts.timeStyle,
+    year: opts.noYear ? undefined : "numeric",
+  }).format(dt);
+
+  return formatted + timeText;
+}