Minecraft wiki entry for Timeline_of_events, associated text: 1 – Java: First Multiplayer test (Classic 0.0.15a (Multiplayer Test 1)). Notch starts his new job at Jalbum.[8]
7 – Java: Multiplayer released (Classic 0.0.16a).
14 – Java: Custom Skins released (Classic 0.0.18a).