export function parseTimestamp(raw?: string | number | Date): Date | undefined {
	if (!raw) {
		return undefined;
	}
	if (raw instanceof Date) {
		return raw;
	}

	if (typeof raw === 'string' && /^[0-9.]+$/.test(raw)) {
		let n = parseFloat(raw);
		const len = Math.floor(n).toString().length;
		/*
    最常见的是 10 位和 13 位
    9999999999 - 10*9 - 1970-04-26
    99999999999 - 11*9 - 1973
    999999999999 - 12*9 - 2001
     */
		if (len <= 11) {
			n *= 1000;
		}
		return new Date(n);
	} else if (typeof raw === 'string') {
		const date = new Date(raw);
		if (!Number.isNaN(+date)) {
			return date;
		}
	}
	throw new Error(`parseTimestamp: invalid "${raw}"`);
}