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There is no time machine in minecraft. The "Time Machine" is a nickname for the Minecraft Launcher, the startup of the game. You can access old versions of Minecraft.
The Minecraft launcher (when you first start the game) will ask you, when there is an update available, if you want to update or keep the old version.
how to log in minecraft 1.3.9
Download the launcher at minecraft.net/download to play Minecraft.
The Minecraft Launcher is 263 KB while the Minecraft folder is approximately 46 MB.