Simple ago function to calculate, with a concise string, how old a post is

time-ago.ts

const DAY_SECONDS = 86400;
const WEEK_SECONDS = 604800;
const YEAR_SECONDS = WEEK_SECONDS * 52;

export function timeAgo(date: Date) {
	const epoch = Math.round(date.getTime() / 1000);
	const now = Math.round(Date.now() / 1000);
	const seconds = now - epoch;
	const minutes = Math.round(seconds / 60);
	const hours = Math.round(seconds / 3600);
	const days = Math.round(seconds / DAY_SECONDS);
	const weeks = Math.round(seconds / WEEK_SECONDS);
	const years = Math.round(seconds / YEAR_SECONDS);

	if (seconds < 15) {
		return 'now';
	} else if (seconds < 60) {
		return `<1m`;
	} else if (minutes < 60) {
		return `${minutes}m`;
	} else if (hours < 24) {
		return `${hours}h`;
	} else if (days < 7) {
		return `${days}d`;
	} else if (weeks < 52) {
		return `${weeks}w`;
	} else {
		return `${years}y`;
	}
}