Pick a date and this fortnight countdown tells you how far away it is in fourteen-day units. For anything a few months out, fortnights sit in a useful middle ground — more concrete than "about three months", less overwhelming than "eighty-seven days".
Why fortnights read better than days
A number of days over about thirty stops meaning much. Fortnights map onto pay cycles and sprint cadences, so "six fortnights" is immediately actionable in a way that "eighty-four days" is not. The same logic is why teams plan in sprints — see fortnightly meeting cadence.