Get time since a Tweet was created

tweet-date.ts

const MS = {
	SECOND: 1000,
	MINUTE: 1000 * 60,
	HOUR: 1000 * 60 * 60,
	DAY: 1000 * 60 * 60 * 24,
} as const

function getTimeSinceTweet(tweetDate: Date): string {
	const currentDate = new Date()
	const diff = currentDate.getTime() - tweetDate.getTime()

	if (diff < MS.MINUTE) return Math.floor(diff / MS.SECOND) + 's'
	if (diff < MS.HOUR) return Math.floor(diff / MS.MINUTE) + 'm'
	if (diff < MS.DAY) return Math.floor(diff / MS.HOUR) + 'h'

	const isCurrentYear = tweetDate.getFullYear() === currentDate.getFullYear()
	const options: Intl.DateTimeFormatOptions = {
		month: 'short',
		day: 'numeric',
		year: isCurrentYear ? undefined : 'numeric',
	}

	return new Intl.DateTimeFormat('en-US', options).format(tweetDate)
}