That’s one of the core mechanics in Ocarina of Time.
Tap for spoiler
You travel between pre-catastrophe Hyrule and post-catastrophe Hyrule by pulling/sheathing the Master Sword in the Cathedral of Time. When you pull it, you travel forward in time until Link is strong enough to carry it and when you sheath it you return to „regular“ (kid) Link‘s time.
That’s one of the core mechanics in Ocarina of Time.
Tap for spoiler
You travel between pre-catastrophe Hyrule and post-catastrophe Hyrule by pulling/sheathing the Master Sword in the Cathedral of Time. When you pull it, you travel forward in time until Link is strong enough to carry it and when you sheath it you return to „regular“ (kid) Link‘s time.
Thanks!