Google has temporarily removed the time line feature from search options. The new Google search options went live in early May. We have a screen shot from even before that shows the time line feature. But it has now been removed.

Current vs Old:

Notice it is now missing, next to “Wonder Wheel.” Why? Well, Google said this is only temporary.

In a Google Web Search Help thread, Googler Jaime said:

There is currently no ETA for when it will return, it has been missing since Monday, October 26th.

Forum discussion at Google Web Search Help.

Update: The Timeline feature is now back as of November 3rd.