---
import updates from "../data/updates.json";
type Update = { date: string; title: string; url: string; group: string };
const initial = Number(Astro.props.limit ?? 5);
const step = Number(Astro.props.step ?? 10);
const items = updates as Update[];
/** ISO の日付（YYYY-MM-DD）を「令和8年9月20日」の形にする */
function toJapaneseDate(iso: string): string {
const [y, m, d] = iso.split("-").map(Number);
let era = "昭和";
let n = y - 1925;
if (y >= 2019 && !(y === 2019 && m <= 4)) {
era = "令和";
n = y - 2018;
} else if (y >= 1989) {
era = "平成";
n = y - 1988;
}
return `${n === 1 ? `${era}元年` : `${era}${n}年`}${m}月${d}日`;
}
---
{items.map((u, index) => (
- = initial}>
{u.group && {u.group}}
{u.title}
))}
{
items.length > initial && (
)
}