Converts a time duration to string. for example: 38 minutes 53 seconds ago OR 2 days 58 minutes ago. maxPrecision is the max number of time components in the result.

ago.go

func ago(t time.Duration) (o string) {
	const day = time.Hour * 24
	const week = day * 7
	const month = day * 30
	const year = day * 365
	const maxPrecision = 2

	if t.Seconds() < 1 {
		return "seconds ago"
	}

	for precision := 0; t.Seconds() > 0 && precision < maxPrecision; precision++ {
		switch {
		case t >= year:
			years := t / year
			t -= years * year
			o += fmt.Sprintf("%d years ", years)
		case t >= month:
			months := t / month
			t -= months * month
			o += fmt.Sprintf("%d months ", months)
		case t >= week:
			weeks := t / week
			t -= weeks * week
			o += fmt.Sprintf("%d weeks ", weeks)
		case t >= day:
			days := t / day
			t -= days * day
			o += fmt.Sprintf("%d days ", days)
		case t >= time.Hour:
			hours := t / time.Hour
			t -= hours * time.Hour
			o += fmt.Sprintf("%d hours ", hours)
		case t >= time.Minute:
			minutes := t / time.Minute
			t -= minutes * time.Minute
			o += fmt.Sprintf("%d minutes ", minutes)
		case t >= time.Second:
			seconds := t / time.Second
			t -= seconds * time.Second
			o += fmt.Sprintf("%d seconds ", seconds)
		}
	}

	return o + "ago"
}