Notch's Versioning is a mod that restores the classic version numbering system used in Minecraft releases.

What does it do?

Minecraft recently changed its versioning scheme from <major>.<minor>.<patch> (e.g., 1.21.1) to <year>.<drop>.<hotfix> (e.g., 26.1.1).

Notch's Versioning calculates and displays the "legacy" version number by continuing the count from 1.21 (the last version before the switch).

The Logic

The mod treats every new "Drop" as a new minor update (1.x).

Official Version	Logic	Legacy Version
26.1	The 1st drop after 1.21	1.22
26.1.5	Hotfix remains the same	1.22.5
26.2	The 2nd drop	1.23
26.2 Snapshot 1	Snapshots are mapped too	1.23 Snapshot 1
27.1	Carries over drops from '26	1.xx (calculated dynamically)

This allows you to play the latest updates while keeping the nostalgic version numbers you are used to.