Add date and holiday detection to clock

src/components/clock.tsx

@@ -2,29 +2,91 @@
 
 import { useEffect, useState } from "react";
 
+const holidays: Record<string, { label: string; emoji: string }> = {
+	"01-01": { label: "New Year", emoji: "🎉" },
+	"02-14": { label: "Valentine's Day", emoji: "❤️" },
+	"03-17": { label: "St. Patrick's Day", emoji: "🍀" },
+	"04-01": { label: "April Fools", emoji: "🤡" },
+	"05-05": { label: "Cinco de Mayo", emoji: "🌮" },
+	"06-21": { label: "Summer Solstice", emoji: "☀️" },
+	"07-04": { label: "Independence Day", emoji: "🎆" },
+	"10-31": { label: "Halloween", emoji: "🎃" },
+	"11-01": { label: "Day of the Dead", emoji: "💀" },
+	"12-24": { label: "Christmas Eve", emoji: "🎄" },
+	"12-25": { label: "Christmas Day", emoji: "🎄" },
+	"12-26": { label: "Boxing Day", emoji: "🎁" },
+	"12-31": { label: "New Year's Eve", emoji: "🎉" },
+};
+
+function getEaster(year: number): Date {
+	const a = year % 19;
+	const b = Math.floor(year / 100);
+	const c = year % 100;
+	const d = Math.floor(b / 4);
+	const e = b % 4;
+	const f = Math.floor((b + 8) / 25);
+	const g = Math.floor((b - f + 1) / 3);
+	const h = (19 * a + b - d - g + 15) % 30;
+	const i = Math.floor(c / 4);
+	const k = c % 4;
+	const l = (32 + 2 * e + 2 * i - h - k) % 7;
+	const m = Math.floor((a + 11 * h + 22 * l) / 451);
+	const p = h + l - 7 * m + 114;
+	return new Date(year, Math.floor(p / 32) - 1, (p % 31) + 1);
+}
+
+function getHoliday(now: Date): { label: string; emoji: string } | null {
+	const key = `${String(now.getMonth() + 1).padStart(2, "0")}-${String(now.getDate()).padStart(2, "0")}`;
+	const staticHoliday = holidays[key];
+	if (staticHoliday) return staticHoliday;
+
+	const year = now.getFullYear();
+	const easter = getEaster(year);
+	const emd = `${String(easter.getMonth() + 1).padStart(2, "0")}-${String(easter.getDate()).padStart(2, "0")}`;
+
+	const movable: Record<string, { label: string; emoji: string }> = {
+		[emd]: { label: "Easter", emoji: "🐣" },
+	};
+	const ePlus1 = new Date(easter);
+	ePlus1.setDate(ePlus1.getDate() + 1);
+	const ep1k = `${String(ePlus1.getMonth() + 1).padStart(2, "0")}-${String(ePlus1.getDate()).padStart(2, "0")}`;
+	movable[ep1k] = { label: "Easter Monday", emoji: "🐣" };
+
+	return movable[key] ?? null;
+}
+
 export function Clock() {
-	const [time, setTime] = useState("");
+	const [display, setDisplay] = useState("");
 
 	useEffect(() => {
 		function update() {
 			const now = new Date();
-			setTime(
-				now.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" }),
-			);
+			const holiday = getHoliday(now);
+			const date = now.toLocaleDateString([], {
+				day: "numeric",
+				month: "short",
+			});
+			const time = now.toLocaleTimeString([], {
+				hour: "2-digit",
+				minute: "2-digit",
+			});
+			const parts = [date, time];
+			if (holiday) parts.push(`${holiday.emoji} ${holiday.label}`);
+			setDisplay(parts.join(" • "));
 		}
 		update();
 		const id = setInterval(update, 30_000);
 		return () => clearInterval(id);
 	}, []);
 
-	if (!time) return null;
+	if (!display) return null;
 
 	return (
 		<span
-			className="text-[11px] font-bold tabular-nums select-none"
+			className="text-[11px] font-bold tabular-nums select-none whitespace-nowrap"
 			style={{ color: "color-mix(in srgb, var(--color-text-muted) 60%, transparent)" }}
 		>
-			{time}
+			{display}
 		</span>
 	);
 }